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Stalin also spent the time leading to the Molotov Ribbentrop pact desperately trying to get anyone else to sign a defensive agreement to resist Germany, he kept getting blown off by France and the UK. It was a decision made to delay German action to buy time for the Red Army to fight alone, since evidently nobody else was interested in dealing with Hitler.

I had always been taught that he was a scheming bastard who was betrayed, I was shocked to learn how much effort was put into attempting to preemptively check the Germans.