The European Union as an International Legal Person: Treaties, Representation, and International Responsibility

The European Union as an International Legal Person: Treaties, Representation, and International Responsibility

Introduction

The European Union occupies an unusual position in the international legal system. It is neither a sovereign state nor a conventional international organisation whose activities are confined to cooperation between national governments. It is a legal entity established by international treaties, endowed with its own institutions, powers, legal order, and capacity to act beyond its borders. It negotiates and concludes international agreements, participates in international organisations, maintains diplomatic relations, adopts restrictive measures, conducts trade policy, and assumes obligations under international law.

The legal foundation of this external capacity is Article 47 of the Treaty on European Union (TEU), which expressly provides that the Union shall have legal personality. This provision, introduced by the Treaty of Lisbon, gave an explicit and unified treaty basis to the Union’s international legal identity. It confirmed that the EU is not merely a collective name for its Member States when they act together. It is an independent legal person capable of holding rights and obligations under international law.

Legal personality, however, must not be confused with unlimited international competence. The EU can act internationally only within the powers conferred upon it by its founding treaties. Its international agreements must have a valid legal basis, its institutions must follow the prescribed procedures, and its external action remains subject to the principles of conferral, subsidiarity where applicable, proportionality, institutional balance, and judicial review.

The EU’s international legal personality therefore raises several connected questions. Who has authority to negotiate and conclude treaties on its behalf? When does an international agreement bind the Union and its Member States? Who represents the EU in diplomatic relations and international organisations? Can the Union incur international responsibility for unlawful conduct? How is responsibility allocated when both the EU and its Member States participate in an international agreement or contribute to the same internationally wrongful act?

These questions are central to understanding the EU as an actor in public international law. They reveal the relationship between the Union’s autonomous legal identity and the continuing international legal personality of its Member States.

This article examines the legal foundations of the EU’s international personality, its treaty-making powers, the division of external competences, diplomatic representation, participation in international organisations, the legal effects of international agreements, and the principles governing international responsibility.

1. The Legal Personality of the European Union

1.1 Article 47 TEU and the Lisbon Treaty

Article 47 TEU states:

“The Union shall have legal personality.”

The provision is short, but its consequences are extensive. It recognises the EU as a subject of law distinct from its Member States and capable of participating in legal relationships in its own name.

Before the Lisbon Treaty entered into force on 1 December 2009, the European Community possessed express legal personality under Article 281 of the Treaty establishing the European Community. The European Union, as it then existed under the pre-Lisbon structure, did not have the same single and explicit recognition. Its external activities were distributed across the European Community framework, the Common Foreign and Security Policy, and police and judicial cooperation arrangements.

The Lisbon Treaty abolished the former pillar structure and provided a unified legal personality for the Union. The European Union succeeded the European Community, while the separate European Community legal personality ceased to exist as an independent institutional framework.

This reform did not transform the EU into a state. International legal personality is not exclusive to sovereign states. International organisations may possess legal personality where their constituent instruments establish their independent capacity to hold rights and obligations and where their functions require such capacity.

The International Court of Justice recognised this broader principle in its 1949 advisory opinion on Reparation for Injuries Suffered in the Service of the United Nations. The Court concluded that the United Nations possessed international legal personality and could bring an international claim for damage suffered by the organisation and its agents.

The EU’s legal personality is expressly recognised by its own founding treaty. Its international capacity is consequently not dependent on treating it as a state or attributing to it the sovereignty of its Member States.

The official EUR-Lex explanation of the Union’s legal personality identifies its ability to conclude international agreements, participate in international organisations, join international conventions, maintain diplomatic relations, and bring or defend international claims. EUR-Lex: Legal Personality of the EU.

1.2 Legal personality and international capacity

Legal personality describes the capacity to possess rights and obligations under a legal system. It does not automatically establish the full range of powers that a legal person may exercise.

For the EU, the distinction is particularly important. Article 47 TEU establishes its legal personality, but the substantive powers of the Union arise from the Treaties and the principle of conferral.

Under Article 5(1) TEU, the limits of Union competences are governed by the principle of conferral. The Union may act only within the competences that the Member States have conferred upon it in the Treaties. Competences not conferred upon the Union remain with the Member States.

The EU can therefore possess international legal personality without having general authority over every subject of international relations.

For example, the Union has extensive competence in the common commercial policy. It may negotiate and conclude trade agreements within the scope of that competence. It also has substantial powers in environmental policy, development cooperation, transport, fisheries, and other external fields.

By contrast, Member States retain important national powers in areas such as national security, the organisation of their armed forces, and aspects of foreign policy not transferred to the Union.

The legal personality of the EU must consequently be understood as an institutional capacity exercised through specifically conferred powers.

1.3 The EU as a subject of public international law

The Union’s international legal personality enables it to participate in legal relations with states, international organisations, and other international actors.

Its international rights and obligations may include:

• The right to conclude international agreements within its competence.
• The capacity to participate in international organisations.
• The ability to maintain external representation and diplomatic relations.
• The capacity to enjoy privileges and immunities necessary for its functions.
• The ability to bring international claims or defend claims against it.
• The obligation to comply with applicable rules of international law.
• The possibility of incurring international responsibility for internationally wrongful conduct attributable to it.

These capacities distinguish the Union from a purely diplomatic conference or an informal alliance of states.

The EU’s international personality also has an autonomous dimension. An agreement concluded by the Union is not simply an agreement concluded separately by each Member State. It creates obligations for the Union as an international legal person, subject to the agreement’s terms and the Union’s competence.

At the same time, the Member States do not lose their own international legal personality. They remain sovereign states and continue to participate independently in international relations in areas within their national competence.

2. The Relationship Between EU Legal Personality and Member State Sovereignty

2.1 Separate but interconnected legal persons

The EU and its Member States are distinct legal persons. Their international legal identities coexist, although their respective powers and obligations may overlap.

The Member States established the Union through international treaties. They conferred specific competences upon it and created institutions capable of exercising those competences independently.

This arrangement produces a legal structure in which the Union may act externally in its own name while Member States continue to act internationally in their own capacities.

The distinction becomes particularly important when an international agreement concerns both Union and national competences.

Where the Union possesses exclusive competence, Member States cannot independently exercise that competence in a manner inconsistent with the Union’s powers or common rules. Where competence is shared, both the Union and the Member States may have roles, depending on the legal basis and the extent to which the Union has exercised its powers.

The fact that Member States participate in an agreement does not necessarily mean that the EU lacks legal personality. Equally, the Union’s participation does not automatically remove national powers.

2.2 The principle of conferral in external relations

Article 5 TEU applies to external action as well as internal EU policy.

The Union must identify a legal basis for its international activity. The legal basis determines the nature of the competence, the applicable institutional procedure, and the extent of the Union’s authority.

Article 3(1)(e) TFEU gives the Union exclusive competence in the common commercial policy. Article 3(2) TFEU also establishes exclusive external competence in certain circumstances, including where the conclusion of an international agreement is provided for in a Union legislative act, is necessary to enable the Union to exercise its internal competence, or may affect common rules or alter their scope.

Article 4 TFEU identifies areas of shared competence, while Article 6 lists areas in which the Union has competence to support, coordinate, or supplement Member State action.

The classification of competence is therefore not merely an internal constitutional question. It determines who may undertake international commitments and who must participate in the treaty-making process.

2.3 Institutional autonomy and the independent EU legal order

The EU has developed an autonomous legal order. Its institutions exercise powers under the Treaties, and the Court of Justice of the European Union (CJEU) ensures that the law is observed in the interpretation and application of those Treaties.

This autonomy has consequences for international agreements.

Although the Union is bound by its international obligations, those obligations must be accommodated within the constitutional structure of EU law. An international agreement cannot validly alter the essential allocation of powers between the Union institutions or remove the jurisdiction assigned to the CJEU by the Treaties.

The Court has repeatedly emphasised the importance of preserving the autonomy of EU law. Its Opinion 2/13 on the proposed accession of the EU to the European Convention on Human Rights is an important example. The Court identified difficulties in the draft accession arrangements because they did not sufficiently safeguard the specific characteristics and autonomy of the Union legal order.

The issue is not whether the EU must comply with international law. It must. The question is how international obligations can be incorporated and implemented without undermining the constitutional arrangements established by the Treaties.

3. The Treaty-Making Powers of the European Union

3.1 Article 216 TFEU: the legal basis for international agreements

Article 216(1) TFEU establishes the principal general framework for the Union’s capacity to conclude international agreements.

It provides that the Union may conclude an agreement with one or more third countries or international organisations in four circumstances:

1. Where the Treaties so provide.
2. Where the conclusion of an agreement is necessary to achieve one of the objectives referred to in the Treaties, within the framework of Union policies.
3. Where the agreement is provided for in a legally binding Union act.
4. Where the agreement is likely to affect common rules or alter their scope.

These grounds establish that the EU’s treaty-making capacity is not confined to provisions that expressly name a particular agreement. External competence may also arise from the objectives and structure of the Treaties or from the need to protect existing common rules.

Article 216(2) adds that agreements concluded by the Union are binding upon the institutions of the Union and its Member States.

This provision is fundamental. It establishes that an agreement concluded by the EU is not merely a political declaration. It creates legal obligations that must be respected within the Union’s legal framework.

The official text of Article 216 TFEU should be read together with Article 218, which governs the procedure for negotiating and concluding agreements.

3.2 Express external competence

Some external powers are expressly provided for in the Treaties.

The common commercial policy is the clearest example. Article 207 TFEU places this policy within the Union’s exclusive competence, covering areas such as trade in goods and services, commercial aspects of intellectual property, foreign direct investment, and other matters identified in the provision.

The EU can consequently negotiate trade agreements in its own name within the scope of the common commercial policy.

Other treaty provisions provide for international cooperation or agreements in particular policy areas. These may include environmental policy, development cooperation, association agreements, and cooperation with international organisations.

Express competence provides a relatively clear legal basis, although disputes may still arise over the precise scope of the relevant policy.

3.3 Implied external competence

The Union’s external competence is not limited to powers expressly described as external.

In its judgment in Commission v Council (Case 22/70), commonly known as the ERTA or AETR case, the Court of Justice established an important principle: the exercise of internal Union powers may generate corresponding external competence.

The case concerned the negotiation of an international agreement on road transport. The Court held that when the Union adopts common rules, Member States may no longer undertake international commitments that could affect those rules or alter their scope.

This principle protects the effectiveness and uniform application of EU law.

It means that the Union may acquire exclusive external competence when its internal legislative activity has created common rules that could be affected by international commitments made by Member States.

The principle is now reflected in Article 3(2) TFEU.

Implied external competence is not unlimited. It must be connected to existing Union powers and the legal conditions established by the Treaties. The existence of an internal EU policy does not automatically make every international agreement in that field exclusively an EU matter.

3.4 The principle of exclusivity

Exclusive competence means that only the Union may legislate and adopt legally binding acts in the relevant field, subject to the conditions established by the Treaties.

Where the Union has exclusive external competence, Member States cannot independently conclude international agreements that would interfere with the Union’s authority or undermine common rules.

However, Member States may still participate in the implementation of international obligations or act on behalf of the Union where authorised.

The distinction between exclusive and shared competence is essential in treaty negotiations. It determines whether the EU may conclude an agreement alone or whether Member States must also become parties.

4. Mixed Agreements: When the EU and Member States Act Together

4.1 The meaning of a mixed agreement

A mixed agreement is an international agreement concluded jointly by the European Union and some or all of its Member States, alongside one or more third countries or international organisations.

Mixed agreements arise when the subject matter covers both Union competences and competences that remain with Member States, or when the allocation of competence is sufficiently complex that joint participation is required.

They are particularly common in broad international agreements covering trade, investment, transport, environmental matters, development cooperation, and political association.

The Union and its Member States become parties in their respective capacities. Their participation does not merge their legal personalities.

4.2 Why mixed agreements are necessary

Consider an international agreement containing provisions on trade in goods, foreign direct investment, transport services, and certain matters of national regulation.

The Union may have exclusive competence over many trade provisions. Other provisions may fall within shared competence or remain within Member State competence.

If the agreement cannot be concluded entirely within the Union’s powers, Member States may need to participate as parties.

This arrangement allows the agreement to cover a broader range of subjects while respecting the allocation of competences under EU law.

4.3 Ratification and implementation difficulties

Mixed agreements create procedural complexity because they may require ratification by the Union and by each Member State according to their respective constitutional procedures.

The agreement may therefore enter into force only after the required approvals have been completed, unless its provisions permit a different arrangement.

Provisional application may be used to allow certain parts of an agreement to operate before full ratification is complete. Under Article 218(5) TFEU, the Council may authorise provisional application, subject to the applicable treaty procedure.

Provisional application must be distinguished from final conclusion and entry into force. It allows specified obligations to operate temporarily but does not necessarily resolve all national ratification requirements.

4.4 Opinion 2/15 and the EU–Singapore Free Trade Agreement

The CJEU’s Opinion 2/15 of 16 May 2017 is a leading authority on the allocation of external competences.

The Court examined the proposed EU–Singapore Free Trade Agreement and determined which provisions fell within the Union’s exclusive competence and which required participation by Member States.

It concluded that most of the agreement fell within the Union’s exclusive competence, including substantial parts of the common commercial policy. However, certain provisions, particularly those concerning non-direct foreign investment and investor–state dispute settlement, could not be concluded by the Union alone under the legal framework examined.

The Opinion clarified the limits of the common commercial policy and demonstrated that the classification of an agreement depends on the legal nature of its individual commitments, rather than its general political or economic purpose.

The decision is important because it shows how international legal personality operates in practice: the EU can act as an independent treaty-making subject, but the extent of its participation is determined by the competences conferred upon it.

See CJEU Opinion 2/15.

5. The Procedure for Negotiating and Concluding International Agreements

5.1 Article 218 TFEU

Article 218 TFEU establishes the general procedure for negotiating and concluding international agreements on behalf of the Union.

It provides an institutional framework designed to ensure that external commitments are adopted through the appropriate Union institutions and in accordance with the allocation of powers.

The procedure generally involves several stages:

• A recommendation to open negotiations.
• A Council decision authorising the opening of negotiations.
• The appointment or designation of the Union negotiator or negotiating team.
• The adoption of negotiating directives.
• Negotiation with the third country or international organisation.
• A Council decision authorising signature and, where appropriate, provisional application.
• A decision concluding the agreement.
• Any required European Parliament consent or consultation.

The precise procedure depends on the subject matter of the agreement and the relevant Treaty provisions.

5.2 The role of the Commission

The European Commission generally submits recommendations to the Council concerning the opening of negotiations in areas outside the Common Foreign and Security Policy.

The Council authorises negotiations and may designate the Commission as negotiator.

During negotiations, the Commission must act within the negotiating directives adopted by the Council and maintain the institutional coordination required by EU law.

The Commission also has an important role in representing the Union’s interests in international trade negotiations and in ensuring that proposed agreements remain consistent with Union policies and legislation.

5.3 The role of the Council

The Council is central to the authorisation and conclusion of international agreements.

It authorises the opening of negotiations, adopts negotiating directives, may authorise signature, and ultimately adopts the decision concluding the agreement on behalf of the Union.

Voting rules depend on the legal basis and subject matter. Qualified majority voting is the general rule under Article 218(8) TFEU, but unanimity is required in specified circumstances, including certain sensitive policy areas and where the agreement concerns a field for which unanimity is required for the adoption of internal Union rules.

5.4 The role of the European Parliament

The European Parliament participates in treaty-making through consent or consultation, depending on the agreement.

Article 218(6)(a) TFEU requires Parliament’s consent for several important categories, including association agreements, agreements establishing a specific institutional framework, agreements with important budgetary implications, and agreements covering fields where the ordinary legislative procedure applies.

In other cases, Parliament is consulted.

Article 218(10) also requires Parliament to be immediately and fully informed at all stages of the procedure.

These provisions reflect the democratic dimension of EU external action. International agreements may affect individuals, businesses, public institutions, and national legal systems. Parliamentary participation provides an element of political accountability.

5.5 The Court of Justice and preventive review

Article 218(11) TFEU allows a Member State, the European Parliament, the Council, or the Commission to obtain an opinion from the CJEU on whether an envisaged international agreement is compatible with the Treaties.

If the Court gives an adverse opinion, the agreement cannot enter into force unless it is amended or the Treaties are revised.

This preventive mechanism protects the constitutional structure of the Union before an international commitment becomes binding.

It is particularly significant because international agreements may establish dispute settlement systems, institutional bodies, or interpretative mechanisms that interact with EU law.

The Court’s review ensures that the Union does not undertake international obligations incompatible with its own constitutional framework.

6. The Legal Effects of International Agreements within EU Law

6.1 Binding force under Article 216(2) TFEU

Agreements concluded by the Union bind its institutions and Member States.

This obligation is not confined to the institution that negotiated or signed the agreement. Once an agreement becomes binding on the Union, all Union institutions must respect it when exercising their powers.

Member States must also comply with the obligations arising from the agreement, including where implementation requires national legislation or administrative action.

The precise legal effects depend on the terms of the agreement, the nature of the obligation, and the relevant EU legal principles.

6.2 International agreements as part of the EU legal order

International agreements concluded by the Union form an integral part of EU law once they enter into force for the Union.

The CJEU has consistently recognised that such agreements bind the Union institutions and may be interpreted by the Court.

In Haegeman v Belgian State (Case 181/73), the Court held that provisions of an agreement concluded by the Community formed an integral part of Community law.

This principle allows the Court to interpret international agreements and assess whether EU institutions and Member States have complied with the obligations arising under them.

However, the position of an international agreement within EU law is not identical to that of the founding Treaties. The Treaties remain the primary constitutional framework, and international agreements cannot override them.

6.3 Direct effect of international agreements

An international agreement may produce direct effects within the EU legal order where its provisions are sufficiently clear, precise, and unconditional, taking into account the agreement’s nature and purpose.

Direct effect means that individuals or legal persons may rely on the relevant provision before national courts or the CJEU, where the applicable conditions are satisfied.

The existence of an international obligation does not automatically mean that every provision can be invoked by individuals.

The Court examines the wording, structure, and purpose of the agreement and the nature of the obligation in question.

The position is particularly restrictive in some areas of international trade law. In Portugal v Council (Case C-149/96), the Court held that WTO agreements did not generally possess direct effect in EU law, subject to limited exceptions recognised in its case law.

This distinction is important. The EU may be internationally bound by an agreement even where individuals cannot directly rely on every provision before domestic courts.

6.4 Interpretation and judicial enforcement

The CJEU may interpret provisions of international agreements where they fall within its jurisdiction.

National courts may also be required to apply such provisions as part of the EU legal order, subject to the conditions governing direct effect and the rules of national procedural law.

The Court’s jurisdiction does not mean that it acts as a general international tribunal. Its role is to interpret and apply EU law, including international agreements binding on the Union, within the jurisdiction conferred by the Treaties.

7. Diplomatic Representation and External Relations

7.1 The EU as a diplomatic actor

The Union’s legal personality enables it to maintain diplomatic relations with third countries and international organisations.

It may establish delegations, receive representatives, participate in diplomatic dialogue, and express common positions in international forums.

The Union’s diplomatic presence is distinct from the national diplomatic missions of its Member States. EU delegations represent the Union within the scope of their responsibilities, while national embassies continue to represent their respective states.

7.2 The European External Action Service

The European External Action Service (EEAS) supports the High Representative of the Union for Foreign Affairs and Security Policy.

It was established under the Lisbon Treaty framework and operates as the Union’s diplomatic service.

The EEAS works with the diplomatic services of Member States and includes personnel drawn from relevant EU institutions and national diplomatic services.

Its functions include supporting the development and implementation of the Common Foreign and Security Policy, coordinating diplomatic activity, maintaining relations with third countries, and assisting EU delegations.

The EEAS does not replace national foreign ministries. Instead, it provides an institutional structure through which the Union can conduct external relations in areas where Member States have agreed to act collectively.

7.3 The High Representative

Article 27 TEU gives the High Representative a central role in representing the Union in matters relating to the Common Foreign and Security Policy.

The High Representative:

• Chairs the Foreign Affairs Council.
• Contributes to the development of the Common Foreign and Security Policy.
• Ensures implementation of decisions adopted by the European Council and the Council.
• Conducts political dialogue with third parties on behalf of the Union.
• Expresses the Union’s position in international organisations and at international conferences.

The High Representative also serves as a Vice-President of the European Commission, creating an institutional link between the Union’s diplomatic activity and its wider external policies.

This dual role reflects the need for coordination between the political and economic dimensions of external action.

The relevant Treaty provision is Article 27 TEU.

7.4 The President of the European Council and the Commission

The President of the European Council represents the Union externally on issues concerning the Common Foreign and Security Policy at the level of heads of state or government, without prejudice to the powers of the High Representative.

The European Commission represents the Union externally in areas falling within its responsibilities, with the important exception of the Common Foreign and Security Policy and other cases provided for in the Treaties.

This distribution of functions means that no single office-holder represents the Union in every international matter.

The appropriate representative depends on the policy field, institutional competence, and nature of the external engagement.

8. Participation in International Organisations and International Conferences

8.1 Membership and participation

The Union’s international legal personality enables it to participate in international organisations, although the precise form of participation depends on the organisation’s constituent instrument and the allocation of competences between the EU and its Member States.

Some organisations permit the EU to become a full member. Others allow it to participate as an observer, an enhanced observer, or a participant with specific rights and responsibilities.

The distinction matters because international organisations determine their own membership conditions. The fact that the EU possesses legal personality does not automatically give it admission to every international organisation.

The Union’s participation may also coexist with membership by its Member States. This is particularly visible in international economic institutions, where both the EU and its Member States may participate in their own capacities.

8.2 The European Union and the World Trade Organization

The World Trade Organization provides a particularly clear example of the EU’s international legal personality in operation.

The European Union has been a WTO member since 1 January 1995, initially participating under the name European Communities. Its Member States are also WTO members in their own right.

The EU’s participation reflects its common commercial policy and customs union. The European Commission represents the Union in most WTO meetings, while the Council plays an important role in defining and coordinating the Union’s trade policy.

The arrangement illustrates the coexistence of international legal personalities. The Union participates in the WTO within its competences, while Member States retain their own membership status and obligations.

This structure requires coordination to ensure that the Union and its Member States do not adopt inconsistent positions or breach obligations arising from WTO agreements.

Official information is available through the WTO’s EU member information page and the Council’s overview of EU–WTO relations.

8.3 Participation in the United Nations system

The EU is not a member state of the United Nations and does not possess a vote in the UN General Assembly equivalent to that of sovereign states.

It nevertheless has an important institutional relationship with the United Nations. The Union participates in UN activities, maintains representation, contributes to international cooperation, and may express common positions on matters within its competence.

General Assembly Resolution 65/276 of 3 May 2011 strengthened the EU’s participation rights in the General Assembly. The arrangements allow EU representatives to present common positions, participate in debates, and exercise certain procedural rights, while preserving the voting rights of UN Member States.

The EU also participates in specialised international frameworks and agencies in accordance with their respective rules.

Its status demonstrates that international legal personality does not require identical institutional rights in every organisation. The scope of participation depends on the rules of the organisation concerned.

8.4 International conventions and accession

Article 6(2) TEU provides that the Union shall accede to the European Convention for the Protection of Human Rights and Fundamental Freedoms.

This provision reflects the recognition that the EU can become a party to an international human rights treaty. Accession, however, requires an agreement compatible with the constitutional requirements of EU law and the institutional framework of the Convention.

The CJEU’s Opinion 2/13 of 18 December 2014 concluded that the draft accession agreement then under consideration was incompatible with the Treaties.

The Court identified concerns relating to the autonomy of EU law, the allocation of competences, mutual trust between Member States, and the relationship between the CJEU and the European Court of Human Rights.

The Opinion did not deny the Union’s legal capacity to accede to the Convention. Rather, it held that the particular draft arrangements did not adequately preserve the specific characteristics of the EU legal order.

This distinction is important: international legal personality creates the capacity to enter into an international treaty, but the exercise of that capacity remains subject to the Union’s constitutional requirements.

The text of Opinion 2/13 remains a leading reference on the relationship between international obligations and the autonomy of EU law.

9. Privileges, Immunities, and the Legal Protection of EU Representation

9.1 The need for institutional privileges and immunities

An international legal person must be able to perform its functions independently. The EU therefore requires legal protections for its institutions, representatives, officials, and delegations.

Protocol No 7 on the Privileges and Immunities of the European Union establishes important protections for the Union and its institutional personnel.

These include provisions concerning the inviolability of official premises and archives, immunity from legal process for certain official acts, tax exemptions, and protections necessary for the independent functioning of EU institutions.

The purpose of these privileges is functional rather than personal. They are intended to ensure that EU institutions can perform their responsibilities without improper interference by national authorities.

9.2 Diplomatic status of Union delegations

Article 221 TFEU provides that Union delegations in third countries and at international organisations represent the Union and operate under the authority of the High Representative.

Their legal status is further shaped by the relevant agreements with host states and the applicable rules of international law.

Union delegations may enjoy privileges and immunities necessary for their functions, although their precise status should not be confused automatically with that of a national embassy.

The legal basis is Article 221 TFEU.

10. International Responsibility of the European Union

10.1 Legal personality and responsibility

The possession of international legal personality entails the capacity to bear international obligations. A legal person that can undertake international commitments may also incur responsibility when its conduct breaches an obligation binding upon it.

The EU is therefore capable of incurring international responsibility under the general principles of international law applicable to international organisations.

International responsibility is distinct from political accountability or internal institutional liability. It concerns the legal consequences arising when conduct attributable to an international person constitutes a breach of an international obligation.

The relevant questions are:

• Was an international obligation binding upon the EU?
• Did conduct attributable to the Union breach that obligation?
• Can the conduct be legally attributed to the Union?
• Are there circumstances precluding wrongfulness?
• What legal consequences follow from the breach?
• Which international procedures are available to invoke responsibility?

10.2 The International Law Commission’s Draft Articles

An important reference is the International Law Commission’s 2011 Draft Articles on the Responsibility of International Organizations (ARIO).

The Draft Articles address the responsibility of international organisations, including the attribution of conduct, breach of international obligations, circumstances precluding wrongfulness, reparation, and the responsibility of states in connection with the conduct of international organisations.

They are not a treaty and do not automatically bind the EU as a conventional international instrument. They nevertheless provide an influential framework for analysing the general principles of responsibility applicable to international organisations.

The Draft Articles recognise that an international organisation may incur responsibility for conduct attributable to it where that conduct constitutes a breach of an international obligation binding upon the organisation.

The official materials are available from the International Law Commission: Responsibility of International Organizations.

10.3 Attribution of conduct to the Union

Attribution determines whether particular conduct is legally treated as an act of the EU for the purposes of international responsibility.

Conduct of an organ or agent of an international organisation performed in that capacity is generally attributable to the organisation under the framework of the ARIO Draft Articles.

For the EU, this may include conduct by its institutions, bodies, offices, agencies, and officials when acting within their functions.

The European Commission, Council, European Parliament, European External Action Service, and other Union bodies exercise powers under the Treaties and applicable secondary law. Their conduct may therefore engage the international responsibility of the Union where the relevant legal conditions are satisfied.

Attribution is not determined solely by the physical identity of the person involved. It depends on the legal capacity in which that person acted and the relationship between the conduct and the functions of the organisation.

A national official does not automatically become an EU organ merely because the official implements Union legislation. The official may remain an organ of the Member State, even when applying EU law.

Conversely, where a national authority acts under the effective direction or control of an international organisation in circumstances covered by the applicable rules of responsibility, the attribution analysis may become more complex.

10.4 Breach of an international obligation

Attribution alone is insufficient. International responsibility generally requires a breach of an obligation binding upon the organisation.

For example, the EU may be bound by obligations under a trade agreement, an environmental convention, a bilateral cooperation agreement, or applicable rules of customary international law.

If an EU institution adopts a measure that violates an international obligation binding upon the Union, the conduct may constitute an internationally wrongful act.

The breach must be assessed by reference to the relevant obligation. Some obligations require a particular result; others require conduct of a specified standard or prohibit particular forms of action.

The fact that a measure is valid under EU internal law does not necessarily establish that it complies with international law. Equally, a measure’s incompatibility with an international agreement does not automatically determine its validity under EU law. The two legal assessments are related but distinct.

10.5 Circumstances precluding wrongfulness

International law recognises certain circumstances that may preclude the wrongfulness of conduct that would otherwise constitute a breach.

The ARIO framework addresses matters such as consent, self-defence, countermeasures, force majeure, distress, and necessity, subject to strict legal conditions.

These circumstances do not erase the underlying obligation. They concern whether the conduct is legally wrongful in the circumstances.

Their application to an international organisation must be considered carefully. An organisation’s powers and institutional structure differ from those of a state, and the legal conditions for invoking a particular circumstance may not operate identically in every context.

10.6 Reparation and the consequences of responsibility

Where the EU incurs international responsibility, the general principles of international law may require it to cease the wrongful conduct, provide assurances or guarantees of non-repetition where appropriate, and make full reparation for the injury caused.

Reparation may take the form of restitution, compensation, or satisfaction, depending on the nature of the injury and the circumstances.

Restitution seeks to restore the situation that existed before the wrongful act, where this is materially possible and not excessively burdensome.

Compensation addresses financially assessable damage not made good by restitution.

Satisfaction may include acknowledgment of the breach, an expression of regret, or another appropriate form of recognition.

The precise remedy depends on the obligation breached, the nature of the injury, and the applicable rules of international law.

11. Responsibility of the EU and Its Member States

11.1 The problem of shared conduct

The EU’s institutional structure creates situations in which the Union and Member States participate in the same international legal relationship.

A mixed agreement may impose obligations on both the Union and Member States. Implementation may involve EU institutions, national ministries, regulatory agencies, courts, or other public authorities.

The central question is whether a breach should be attributed to the Union, the Member State, or both.

The answer cannot be determined simply by asking which level of government was politically responsible. International responsibility depends on attribution and the content of the relevant obligation.

11.2 Separate responsibility

The Union and Member States remain distinct international legal persons.

A Member State may incur responsibility for its own internationally wrongful conduct even when that conduct occurs in a field affected by EU law.

Likewise, the Union may incur responsibility for conduct attributable to its institutions or agents.

The existence of a shared policy does not automatically create joint responsibility for every breach.

The legal analysis must identify the relevant international obligation, determine who is bound by it, and establish whose conduct is attributable to the breach.

11.3 Responsibility in connection with the conduct of another

The International Law Commission’s Draft Articles also address circumstances in which an international organisation may incur responsibility in connection with the conduct of a state or another international organisation.

The framework includes situations involving aid or assistance, direction and control, coercion, and circumvention of obligations through decisions or authorisations.

Corresponding provisions address the responsibility of states in connection with the conduct of international organisations.

These rules are significant for the EU because Member States and Union institutions may cooperate closely in implementing international commitments. They help prevent the allocation of institutional functions from being used to evade international obligations.

However, the existence of a close institutional relationship is not enough by itself to establish responsibility. The specific legal requirements must be met.

11.4 Mixed agreements and the allocation of obligations

In mixed agreements, the allocation of responsibility may be particularly difficult where the agreement does not clearly identify which party is responsible for a particular obligation.

The EU and Member States may make declarations of competence or include arrangements governing the exercise of rights and obligations.

Such arrangements may assist in clarifying the division of responsibilities, but they do not necessarily determine how a third party or an international tribunal will assess responsibility under international law.

The international legal position must be distinguished from the internal EU allocation of powers. A dispute over which institution or level of government should implement an obligation does not automatically resolve the question of which international person is responsible for a breach.

12. Dispute Settlement and the Enforcement of International Obligations

12.1 International dispute settlement

The EU may participate in international dispute settlement where the relevant treaty or institutional rules permit it.

The Union may bring claims, defend claims, participate in arbitration, or submit disputes to international adjudicative bodies within the scope of its legal capacity and competence.

The availability of a particular procedure depends on the jurisdiction of the tribunal and the terms of the relevant international agreement.

For example, the WTO dispute settlement system permits the EU to participate as a member. In trade disputes, the Commission represents the Union in proceedings and coordinates the Union’s position.

Other agreements may establish arbitration panels, joint committees, consultation procedures, or specialised dispute settlement mechanisms.

12.2 International tribunals and the autonomy of EU law

The Union’s ability to accept international dispute settlement is subject to an important constitutional limitation: international mechanisms must not undermine the autonomy of the EU legal order or the jurisdiction conferred upon the CJEU by the Treaties.

This does not prevent the EU from accepting binding international adjudication. The Union has done so in several treaty frameworks.

The issue arises where an external tribunal would be empowered to interpret or determine questions of EU law in a manner that interferes with the functions assigned to the CJEU.

The Court’s case law therefore distinguishes between the interpretation of an international agreement by an external tribunal and the authoritative interpretation of EU law itself.

An international tribunal may determine whether the EU has complied with an international obligation. It must not, however, displace the CJEU’s role as the final authority on the interpretation of the Treaties and the validity of Union acts.

12.3 Internal judicial protection

International responsibility must also be distinguished from judicial remedies available within the EU legal order.

Individuals and legal persons may, where the applicable conditions are satisfied, challenge EU measures before the Union courts or national courts.

Article 263 TFEU provides for judicial review of certain acts of EU institutions, bodies, offices, and agencies. Article 268 TFEU, together with Article 340 TFEU, provides the framework for the Union’s non-contractual liability.

Article 340 TFEU concerns the obligation of the Union to make good damage caused by its institutions or servants in the performance of their duties, in accordance with the general principles common to the laws of the Member States.

This is a form of liability within the EU legal order. It is not identical to international responsibility under public international law, although the same conduct may raise questions under both systems.

An internationally wrongful act may therefore give rise to international responsibility, while the same conduct may also be challenged through EU judicial procedures if the relevant conditions are met.

13. The Limits and Challenges of EU International Legal Personality

13.1 Fragmented external representation

The Union’s external representation is distributed among several institutions and office-holders.

The High Representative represents the EU in matters relating to the Common Foreign and Security Policy. The Commission represents the Union in many other external policy fields. The President of the European Council has a separate representational role at the highest political level.

This distribution reflects the Union’s institutional structure, but it can create difficulties in ensuring consistent external communication.

13.2 Competence disputes

The distinction between Union and Member State competence is often difficult to apply to complex international agreements.

Modern agreements may address trade, investment, labour standards, environmental protection, digital regulation, public procurement, transport, and dispute settlement in a single instrument.

The legal classification of each provision may determine whether the agreement can be concluded by the EU alone or requires Member State participation.

The CJEU’s Opinions, particularly Opinion 2/15, demonstrate the importance of careful legal analysis before negotiations are completed.

13.3 The democratic dimension

International agreements can have significant consequences for national economies, regulatory systems, public services, and individual rights.

The involvement of the European Parliament, national parliaments in the ratification of mixed agreements, and the transparency obligations governing the negotiation process are therefore important elements of accountability.

The legal framework must balance effective external action with democratic scrutiny and institutional responsibility.

13.4 International responsibility and practical enforcement

Although the legal principles governing the responsibility of international organisations are increasingly developed, practical questions remain.

International agreements do not always identify clearly which party is responsible for a breach where powers are divided between the Union and Member States.

Some dispute settlement systems are designed primarily for states and may require procedural adaptation when an international organisation participates.

The ARIO Draft Articles provide a structured analytical framework, but they are not a comprehensive treaty regime establishing a universal court or enforcement system for international organisations.

The practical enforcement of responsibility therefore depends on the applicable treaty, the available dispute settlement procedures, and the willingness of the parties to comply with international law.

14. Facts: The EU’s International Legal Personality at a Glance

Legal question	Principal legal basis or rule
Does the EU possess legal personality?	Article 47 TEU
Can the EU conclude international agreements?	Articles 216 and 218 TFEU
Are EU agreements binding on Member States?	Article 216(2) TFEU
Who negotiates many EU external agreements?	Usually the Commission, under Council authorisation
Who authorises and concludes agreements?	The Council, under Article 218 TFEU
What role does Parliament have?	Consent or consultation, depending on the agreement
Who represents the EU in CFSP matters?	High Representative
Who represents the Union through delegations?	EU delegations under Article 221 TFEU
Can the EU participate in international organisations?	Yes, subject to the rules of each organisation
What is a mixed agreement?	An agreement concluded by both the EU and its Member States
Can the EU incur international responsibility?	Yes, where conduct attributable to it breaches an international obligation
What framework addresses international organisations’ responsibility?	2011 ILC Draft Articles on Responsibility of International Organizations
Can the CJEU review proposed international agreements?	Yes, under Article 218(11) TFEU
Does international legal personality make the EU a state?	No

15. Key Takeaways

• Article 47 TEU expressly recognises the European Union as an international legal person distinct from its Member States.
• Legal personality gives the EU the capacity to hold international rights and obligations, but does not confer unlimited powers.
• The principle of conferral governs the Union’s external competence. Its international activity must have a legal basis in the Treaties.
• Article 216 TFEU establishes the principal grounds on which the Union may conclude international agreements.
• Article 218 TFEU regulates the procedure for negotiating, signing, and concluding those agreements.
• The Commission, Council, European Parliament, High Representative, and President of the European Council have distinct roles in external representation and treaty-making.
• Mixed agreements arise when an international agreement covers both Union and Member State competences.
• The CJEU’s Opinion 2/15 clarified the division between exclusive Union competence and competence requiring Member State participation.
• International agreements concluded by the EU bind its institutions and Member States under Article 216(2) TFEU.
• The EU participates in international organisations, including the WTO, in accordance with the rules governing each organisation.
• The Union may incur international responsibility for conduct attributable to it that breaches an international obligation.
• The 2011 ILC Draft Articles provide an influential framework for analysing the responsibility of international organisations, although they are not a binding treaty.
• International responsibility, EU institutional liability, and the judicial review of Union acts are related but legally distinct concepts.
• The autonomy of the EU legal order limits how international dispute settlement mechanisms may interact with the jurisdiction of the CJEU.

16. Frequently Asked Questions

1. Does the European Union have international legal personality?

Yes. Article 47 TEU expressly provides that the Union has legal personality. This enables it to hold international rights and obligations and to participate in international legal relations in its own name.

2. Is the European Union a sovereign state?

No. The EU is an international organisation with a distinctive legal and constitutional structure. It has legal personality and extensive external powers, but it does not possess general sovereignty or unlimited competence.

3. What is the difference between EU legal personality and EU competence?

Legal personality concerns the Union’s capacity to possess rights and obligations. Competence concerns the powers that the Union is legally authorised to exercise. Article 47 TEU establishes personality, while the Treaties determine the scope of its powers.

4. Can the European Union sign treaties with non-EU countries?

Yes. Under Article 216 TFEU, the EU may conclude international agreements with third countries and international organisations where the Treaties provide for such agreements or where the other specified legal conditions are satisfied.

5. Are international agreements concluded by the EU binding on Member States?

Yes. Article 216(2) TFEU provides that agreements concluded by the Union are binding upon its institutions and its Member States.

6. What is a mixed international agreement?

A mixed agreement is an international agreement concluded jointly by the EU and its Member States, usually because the agreement covers both Union competences and matters that remain within Member State competence.

7. Who negotiates international agreements on behalf of the EU?

The European Commission is generally the negotiator in areas outside the Common Foreign and Security Policy, subject to Council authorisation and negotiating directives. In CFSP matters, the High Representative has a central role under the Treaties.

8. What is the role of the Council in treaty-making?

The Council authorises negotiations, adopts negotiating directives, may authorise signature and provisional application, and adopts the decision concluding the agreement on behalf of the Union.

9. Does the European Parliament approve every international agreement?

No. Parliament’s consent is required for the categories specified in Article 218(6)(a) TFEU. In other cases, it is consulted. It must also be kept immediately and fully informed throughout the procedure.

10. Can the Court of Justice examine an international agreement before it enters into force?

Yes. Article 218(11) TFEU allows specified EU institutions and Member States to request an opinion on whether an envisaged agreement is compatible with the Treaties.

11. What is the significance of Opinion 2/15?

Opinion 2/15 clarified the division of competence between the EU and its Member States in relation to the proposed EU–Singapore Free Trade Agreement. It confirmed that much of the agreement fell within exclusive EU competence, while certain provisions required Member State participation.

12. Does the EU have its own diplomatic service?

Yes. The European External Action Service supports the High Representative and the Union’s external diplomatic activity. It works alongside, rather than replacing, the diplomatic services of Member States.

13. Who represents the EU internationally?

Representation depends on the subject matter. The High Representative represents the Union in CFSP matters, the Commission represents it in many other policy fields, and EU delegations represent the Union in third countries and international organisations under Article 221 TFEU.

14. Is the EU a member of the United Nations?

No. The EU is not a UN Member State and does not possess a state member’s voting rights in the General Assembly. It nevertheless has enhanced participation rights and maintains an important relationship with the UN system.

15. Is the EU a member of the World Trade Organization?

Yes. The EU has been a WTO member since 1 January 1995. Its Member States are also WTO members in their own right.

16. Can the European Union be held internationally responsible?

Yes. The Union may incur international responsibility where conduct attributable to it constitutes a breach of an international obligation binding upon it.

17. What is the difference between EU international responsibility and EU non-contractual liability?

International responsibility arises under public international law when the Union breaches an international obligation. Non-contractual liability under Article 340 TFEU concerns damage caused by EU institutions or servants within the EU legal order. The two forms of responsibility have different legal foundations and procedures.

18. Can both the EU and a Member State be responsible for the same international breach?

Potentially, yes, but joint responsibility is not automatic. It depends on the obligations binding upon each legal person, the attribution of the relevant conduct, and the applicable rules of international responsibility.

19. Are the International Law Commission’s Draft Articles legally binding on the EU?

The 2011 Draft Articles on the Responsibility of International Organizations are not a treaty and are not binding merely by virtue of their adoption. They nevertheless provide an influential framework for analysing international responsibility.

20. Can an international tribunal interpret EU law?

An international tribunal may interpret the international agreement conferring jurisdiction upon it and determine whether the EU has complied with its international obligations. However, it cannot displace the CJEU’s role as the authoritative interpreter of EU law within the Union’s legal order.

17. Conclusion

The international legal personality of the European Union is one of the defining characteristics of its position in contemporary public international law. Article 47 TEU establishes the Union as an independent legal person, capable of concluding treaties, maintaining diplomatic relations, participating in international organisations, and assuming international obligations.

Yet the significance of this personality lies not simply in the EU’s ability to act internationally. It lies in the legal framework through which that action is organised and controlled. The Union’s treaty-making powers are governed by the principle of conferral, its institutions operate within carefully defined procedural responsibilities, and its international commitments must remain compatible with the constitutional structure of EU law.

The relationship between the Union and its Member States is particularly important. They remain separate international legal persons, but their external activities frequently intersect. Mixed agreements, shared competences, coordinated diplomatic representation, and the implementation of international obligations require a sophisticated system of legal cooperation.

International responsibility completes this framework. The EU is not merely an organisation capable of claiming rights under international law; it must also answer for breaches of obligations attributable to it. The developing principles governing the responsibility of international organisations provide the legal tools for assessing such conduct, while the Union’s own courts provide mechanisms for reviewing institutional action and liability within the EU legal order.

The European Union therefore represents a distinctive form of international legal actor: an organisation with an autonomous legal personality, extensive but conferred external powers, a complex system of diplomatic representation, and the capacity to bear international responsibility. Understanding this structure is essential to understanding how the Union participates in the international legal system without becoming a sovereign state or absorbing the separate legal identities of its Member States.

18. Primary Legal Sources and Further Reading

Founding Treaties and institutional powers

• Article 47 TEU – Legal personality of the Union
• Consolidated Treaty on European Union
• Article 216 TFEU – Conclusion of international agreements
• Article 218 TFEU – Procedure for negotiating and concluding international agreements
• Article 207 TFEU – Common commercial policy
• Article 221 TFEU – Union delegations
• Protocol No 7 on the Privileges and Immunities of the European Union

Court of Justice of the European Union

• Case 22/70, Commission v Council (ERTA)
• Case 181/73, Haegeman v Belgian State
• Case C-149/96, Portugal v Council
• Opinion 2/13 – Accession of the EU to the ECHR
• Opinion 2/15 – EU–Singapore Free Trade Agreement

International law and institutional participation

• International Law Commission – Draft Articles on the Responsibility of International Organizations
• World Trade Organization – European Union Member Information
• Council of the European Union – The EU and the World Trade Organization
• European External Action Service
• EUR-Lex – Legal Personality of the European Union