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The Molotov-Ribbentrop Pact was a controversial peace pact signed by the Soviet Union and Nazi Germany on August 23, 1939. The pact, which was also known as the Nazi-Soviet Pact, was a non-aggression pact between the two countries that divided Eastern Europe into spheres of influence. The pact lasted for 22 months and was broken by Germany when it invaded the Soviet Union on June 22, 1941.