What military alliance was formed in 1955 between the Soviet Union and Eastern European nations?

The Warsaw Pact was the military alliance established in 1955, primarily in response to the formation of NATO. This agreement brought together the Soviet Union and several Eastern European countries—including Poland, East Germany, Czechoslovakia, Hungary, Romania, and Bulgaria—into a collective defense framework. The pact was intended to consolidate military power and strengthen the standing of Communist nations against the perceived threat from the West during the Cold War.

Since NATO was founded in 1949 and comprised Western nations, it served a different purpose and ideology than the Warsaw Pact. Both the Eastern Bloc Alliance and the Iron Curtain Coalition are not officially recognized terms for a military alliance and do not specifically define a formal agreement like the Warsaw Pact does; thus, they do not accurately represent the military coalition formed in 1955.