The name of the alliance established by European communist nations is called the Warsaw Pact.
What is the Warsaw Pact?
This was known to be an alliance that was set up in 1955. the reason for it was so that it could further Communist growth and thus it made the United States and some other Western nations to enter a kind of alliance called the North Atlantic Treaty Organization (NATO).
Based on the above, the Soviet Union and its some of its supporters Communist nations that are found in Eastern Europe were said to have set up a rival alliance called the the Warsaw Pact, in 1955.
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