Treaty on European Union (consolidated version)

Article 17

1. The common foreign and security policy shall include all questions relating to the security of the Union, including the progressive framing of a common defence policy, in accordance with the second subparagraph, which might lead to a common defence, should the European Council so decide. It shall in that case recommend to the Member States the adoption of such a decision in accordance with their respective constitutional requirements.

The Western European Union (WEU) is an integral part of the development of the Union providing the Union with access to an operational capability notably in the context of paragraph 2. It supports the Union in framing the defence aspects of the common foreign and security policy as set out in this Article. The Union shall accordingly foster closer institutional relations with the WEU with a view to the possibility of the integration of the WEU into the Union, should the European Council so decide. It shall in that case recommend to the Member States the adoption of such a decision in accordance with their respective constitutional requirements.

The policy of the Union in accordance with this Article shall not prejudice the specific character of the security and defence policy of certain Member States and shall respect the obligations of certain Member States, which see their common defence realised in the North Atlantic Treaty Organisation (NATO), under the North Atlantic Treaty and be compatible with the common security and defence policy established within that framework.

The progressive framing of a common defence policy will be supported, as Member States consider appropriate, by cooperation between them in the field of armaments.

2. Questions referred to in this Article shall include humanitarian and rescue tasks, peacekeeping tasks and tasks of combat forces in crisis management, including peacemaking.

3. The Union will avail itself of the WEU to elaborate and implement decisions and actions of the Union which have defence implications.

The competence of the European Council to establish guidelines in accordance with Article 13 shall also obtain in respect of the WEU for those matters for which the Union avails itself of the WEU.

When the Union avails itself of the WEU to elaborate and implement decisions of the Union on the tasks referred to in paragraph 2 all Member States of the Union shall be entitled to participate fully in the tasks in question. The Council, in agreement with the institutions of the WEU, shall adopt the necessary practical arrangements to allow all Member States contributing to the tasks in question to participate fully and on an equal footing in planning and decision-taking in the WEU.

Decisions having defence implications dealt with under this paragraph shall be taken without prejudice to the policies and obligations referred to in paragraph 1, third subparagraph.

4. The provisions of this Article shall not prevent the development of closer cooperation between two or more Member States on a bilateral level, in the framework of the WEU and the Atlantic Alliance, provided such cooperation does not run counter to or impede that provided for in this Title.

5. With a view to furthering the objectives of this Article, the provisions of this Article will be reviewed in accordance with Article 48.