By May 1945, the Red Army had conquered the pre-1941 USSR, (Baltic States, Poland, eastern Germany, Romania, Bulgaria, Hungary, and parts of Czechoslovakia). Became "satellite states," forcibly allied with the USSR & adopting political and economic systems modeled on it. In 1955, they were forced to join the Warsaw Pact, a military alliance led by the USSR to counter NATO. Yugoslavia and Albania exceptions, remaining independent of Soviet control despite being Communist.
-