The military of the European Union comprises the several national armed forces of the Union's 28 member states, as the policy area of defence has remained primarily the domain of nation states. European integration has however been deepened in this field in recent years, with the framing of a Common Security and Defence Policy (CSDP) branch for the Union's Common Foreign and Security Policy (CFSP) as well as the creation of separate international forces revolving around the EU's defence. A number of CSDP military operations have been deployed in recent years. The principal military alliance in Europe remains NATO, which includes 22 of all EU member states as well as other non-EU European countries, Turkey, Albania, the United States and Canada.
Several prominent leaders, including former French President Nicolas Sarkozy, German Chancellor Angela Merkel, Italian Foreign Minister Franco Frattini and former Belgian Prime Minister Guy Verhofstadt, have voiced support for a common defence for the Union.[3][4][5] This possibility, requiring unanimous support among the member states, was formally laid down in Article 42 of the Treaty on European Union upon the entry into force of the Treaty of Lisbon on 1 December 2009.[6] Furthermore, the Treaty of Lisbon extended the enhanced co-operation provision to become available for application in the area of defence. This mechanism enables a minimum number of member states to deepen integration within the EUs institutional framework, without the necessity of participation for reluctant member states.
EU member only
NATO member only
Member of both
Following the end of World War II and the defeat of the Axis Powers, the Dunkirk Treaty was signed by France and the United Kingdom on 4 March 1947 as a Treaty of Alliance and Mutual Assistance against a possible German attack in the aftermath of World War II. The Dunkirk Treaty entered into force on 8 September 1947. The 1948 Treaty of Brussels established the military Western Union Defence Organisation with an allied European command structure under Field Marshal Montgomery. Western European powers, except for Ireland, Sweden, Finland and Austria, signed the North Atlantic Treaty alongside the United States and Canada which only created a passive defence association until 1951 when, during the Korean War, the existing and fully functioning Western Union Defence Organisation was augmented to form the North Atlantic Treaty Organisation, NATO.
In the early 1950s, France, Germany, Italy and the Benelux countries made an attempt to integrate the militaries of mainland western Europe, through the treaty establishing the European Defence Community (EDC). This scheme did however not enter into force, as it failed to obtain approval for ratification in the French National Assembly, where Gaullists feared for national sovereignty and Communists opposed a European military consolidation that could rival the Soviet Union. The failure to establish the EDC resulted in the 1954 amendment of the Treaty of Brussels at the London and Paris Conferences which in replacement of EDC established the political Western European Union (WEU) out of the earlier established military Western Union Defence Organisation and included West Germany and Italy in both WEU and NATO as the conference ended the occupation of West Germany and the defence aims had shifted from Germany to the Soviet Union.
Out of the 28 EU member states, 21 are also members of NATO. Another 3 NATO members are EU Applicants and 1 is solely a member of the European Economic Area. In 1996, the Western European Union (WEU) was tasked by NATO to implement a European Security and Defence Identity within NATO, which later was passed over to the EU Common Security and Defence Policy as all Western European Union functions were transferred to the European Union through the Lisbon Treaty. The memberships of the EU and NATO are distinct, and some EU member states are traditionally neutral on defence issues. Several of the new EU member states were formerly members of the Warsaw Pact.
Following the Kosovo War in 1999, the European Council agreed that "the Union must have the capacity for autonomous action, backed by credible military forces, the means to decide to use them, and the readiness to do so, in order to respond to international crises without prejudice to actions by NATO". To that end, a number of efforts were made to increase the EU's military capability, notably the Helsinki Headline Goal process. After much discussion, the most concrete result was the EU Battlegroups initiative, each of which is planned to be able to deploy quickly about 1500personnel.[7]
The EU currently has a limited mandate over defence issues, with a role to explore the issue of European defence agreed to in the Amsterdam Treaty, as well as oversight of the Helsinki Headline Goal Force Catalogue (the 'European Rapid Reaction Force') processes. However, some EU states may and do make multilateral agreements about defence issues outside of the EU structures.
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