Answer :
Final answer:
The Warsaw Pact was a military alliance formed by the Soviet Union in response to NATO, comprising Communist nations in Eastern Europe.
Explanation:
The military alliance formed by the Soviet Union in response to NATO's formation was called the Warsaw Pact. This alliance included the Soviet Union and various Communist nations of Eastern Europe from 1955 until the Soviet Union dissolved in 1991. The Warsaw Pact was a direct response to the establishment of NATO in April 1949.
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