- Distinguish from the Warsaw Convention, which is an agreement among airlines about financial liability and the Treaty of Warsaw (1970) between West Germany and the People's Republic of Poland.
The Warsaw Pact or Warsaw Treaty Organization was officially named the Treaty of Friendship, Co-operation and Mutual Assistance, and was an organization of Central and Eastern European Communist states.
It was established in 1955 in Warsaw, Poland against the NATO. The Pact lasted till the end of the Cold War when some members quit in 1991, following the collapse of the Eastern bloc and political changes in the Soviet Union. The treaty was signed in Warsaw, on May 14, 1955 and official copies were made in the languages of Russian, Polish, Czech and German.
- Soviet Union (main contributor)
- East Germany
- Albania (withdrew its support in 1962 over ideological differences, formally left in 1968)
All the Communist states of Central and Eastern Europe signed except Yugoslavia.