The NATO-EU Joint Declarations are a series of high-level political instruments signed by the Secretary General of the North Atlantic Treaty Organization, the President of the European Council, and the President of the European Commission that codify the strategic partnership between the two Brussels-based organisations. The first such text was signed on 8 July 2016 in Warsaw on the margins of the NATO Summit; a second followed on 10 July 2018 in Brussels; and a third was concluded on 10 January 2023, again in Brussels. The declarations build on the earlier "Berlin Plus" arrangements of 2002–2003, which gave the EU access to NATO planning capabilities for crisis-management operations, and on the 2002 NATO-EU Declaration on the European Security and Defence Policy (ESDP). Unlike a treaty, a Joint Declaration is not binding under international law; it is a political commitment whose authority derives from the signatures of the principals and from subsequent endorsement by the North Atlantic Council and the Council of the European Union.
The procedural mechanics begin with negotiation between the NATO International Staff and the European External Action Service (EEAS), supported by the Commission's Directorate-General for Defence Industry and Space (DG DEFIS) and the European Defence Agency. Draft language is circulated to the 32 NATO Allies and the 27 EU Member States — overlapping but non-identical memberships — through their respective Permanent Representations in Brussels. Consensus is required in both fora before signature. Once signed, the declarations are operationalised through a "common set of proposals" agreed by the two Councils: 42 proposals were endorsed in December 2016, a further 32 in December 2017, and additional tranches subsequently. Implementation is monitored through twice-yearly progress reports submitted jointly by the NATO Secretary General and the EU High Representative.
The 2016 Warsaw Declaration identified seven areas of cooperation: countering hybrid threats; operational cooperation including maritime issues; cyber security and defence; defence capabilities; defence industry and research; exercises; and capacity-building for partners in the East and South. The 2018 text added military mobility, counter-terrorism, women, peace and security, and resilience against chemical, biological, radiological and nuclear risks. The 2023 declaration, signed in the shadow of Russia's full-scale invasion of Ukraine, explicitly named the People's Republic of China as a systemic challenge for the first time in such a document and elevated emerging and disruptive technologies, climate change, space, and the protection of critical infrastructure — the latter accelerated by the September 2022 sabotage of the Nord Stream pipelines.
Contemporary implementation is visible across multiple files. The Military Mobility initiative, led by the Netherlands within the EU's Permanent Structured Cooperation (PESCO) framework and coordinated with NATO's Enablement Plan for SACEUR's Area of Responsibility, harmonises customs procedures and infrastructure standards for cross-border troop movements. The European Centre of Excellence for Countering Hybrid Threats, established in Helsinki in 2017, draws members from both organisations. Staff-to-staff dialogue between the EEAS Crisis Management and Planning Directorate and NATO's International Military Staff is now routine, and the NATO Secretary General Jens Stoltenberg (until October 2024) and his successor Mark Rutte regularly attend the EU Foreign Affairs Council in its defence configuration.
The declarations should be distinguished from the Berlin Plus arrangements, which are a specific operational mechanism allowing the EU to draw on NATO assets — used for Operation Concordia in North Macedonia in 2003 and EUFOR Althea in Bosnia and Herzegovina from 2004. They should also be distinguished from the EU's Strategic Compass, adopted by the Council in March 2022, which is an internal EU planning document, and from NATO's Strategic Concept adopted at the Madrid Summit in June 2022. The Joint Declarations are the connective tissue between these parallel strategic frameworks rather than a substitute for either. Nor are they to be confused with bilateral US-EU dialogues such as the Trade and Technology Council.
Edge cases and controversies persist. The "Turkey-Cyprus problem" — Ankara's objections to Nicosia's participation in NATO-classified exchanges, and Cyprus's reciprocal blocking of Turkish participation in EU defence initiatives — continues to constrain information-sharing under the 2003 NATO-EU Security of Information Agreement. France has historically pressed for greater EU strategic autonomy, sometimes in tension with Atlanticist member states such as Poland and the Baltic three; the 2023 declaration's language on autonomy was negotiated carefully to reassure both camps. Finland's accession to NATO in April 2023 and Sweden's in March 2024 narrowed but did not eliminate the membership gap: Austria, Ireland, Malta and Cyprus remain EU members outside the Alliance.
For the working practitioner, the Joint Declarations function as the authoritative reference document when drafting national position papers, parliamentary briefings, or speaking points for ministerial meetings in either organisation. Desk officers in foreign ministries cite specific paragraph numbers and the corresponding "common set of proposals" when justifying budget lines for military mobility, cyber resilience, or counter-hybrid measures. Journalists and analysts should read the declarations alongside the implementation progress reports to gauge the gap between political ambition and operational delivery — a gap that has narrowed measurably since February 2022 but remains the principal metric by which the transatlantic defence relationship is judged.
Example
In January 2023, NATO Secretary General Jens Stoltenberg, European Council President Charles Michel, and European Commission President Ursula von der Leyen signed the third Joint Declaration in Brussels, identifying China as a systemic challenge.