Molotov Ribbentrop Pact of 1939

Stalin was actually warned about Operation Barbarossa, the Nazi invasion of Soviet Union, weeks before it happened. He refused to believe that the Nazis had broken the Molotov Ribbentrop Pact of 1939. The pact was a non-aggression pact between Nazi Germany and the Soviet Union that enabled those two powers to partition Poland between them. He dismissed the reports of war as British provocations. More than 800,000 Soviets were killed, and 6 million were captured.