• Lisbon Treaty - Articles 42 and 46 of the Treaty on European Union

  Protocol No 10 annexed to the treaty - The permanent structured cooperation in defence (PSCD)

  European Parliament resolution of 22 November 2016 on the European Defence Union

  
  Security and defense key documents:

  A Global Strategy for the European Union’s Foreign And Security Policy
  
  Bratislava Declaration and Roadmap (16 September 2016)

  Security package

• High Representative of the Union for Foreign Affairs and Security Policy, Vice-President of the European Commission, and Head of the European Defence Agency: Implementation Plan on Security and Defence (14 November 2016)
   
• European Defence Action Plan: Towards a European Defence Fund (30 November 2016)
   
• EU-NATO joint declaration (8 July 2016)
   
• EU-NATO cooperation: Council adopt conclusions to implement Joint Declaration (6 December 2016)
   
• European Council conclusions, 15 December 2016

Reflection paper on the futuure on European defence (7 June 2017)

European Council meeting Conclusions (22 and 23 June 2017) - the Council focused in particular on European security and defense cooperation.

European Parliament resolution of 13 June 2018 on EU-NATO relations