The North Atlantic Treaty Organisation (NATO, or the Atlantic Alliance) was founded by the North Atlantic Treaty, also known as the Treaty of Washington, signed on 4 April 1949, and has its headquarters in Brussels. It currently has 28 members, following successive enlargements:
- 1949 (12 founding members): Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom & the United States;
- February 1952: Greece & Turkey;
- May 1955: West Germany;
- May 1982: Spain;
- March 1999: the Czech Republic, Hungary and Poland;
- March 2004: Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia;
- 1 April 2009: Albania and Croatia.
EU countries’commitments and cooperation under the common security and defence policy are consistent with their commitments under NATO.
Source: EUR Lex Glossary