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So Hitler and Stalin signed a treaty known as the Molotov-Ribbentrop Pact where each pledged to remain neutral in the event that either nation were attacked by a third party. It remained in effect until 22 June 1941, when Germany invaded the Soviet Union entitled Operation Barbarossa.
Both men had a reputation of being power hungry and trustworthiness being questionable at best. It was only a matter of time until one of them broke the pact.
Lets say it was the other way around and Operation Barbarossa was caused by Stalin, how do you think it would affect the rest of World War II?
Would Nazi Germany end up being the dominant force in Europe at the end of the War? Provided that the U.S. joins the war, would they take Hitler's side?