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WI either Stalin had a personality transplant or ceased breathing some time in 1939.
Assuming other events were as OTL except for Polish officers held not murdered.
Could a deal have been done allowing Poland the level of independence Finland had. If that happened and the Soviet Union actively assisted the 1944 Warsaw rising could that have shortened the European War.
I am kind of guessing roughly the same division of Germany with the key exception of no Western allied occupation of West Berlin.