I was having a discussion with a friend of mine. She told me that even if Hitler and the Nazis never came to power in Germany, a Second World War, or at least a Major European war was inevitable, because if Hitler didn't start it Stalin would. We already know from OTL that Stalin was after the Baltic States and Finland at least. Hypothetically, if Stalin invaded Poland by himself, how would Wiemar Germany react? How would the West react to a Wiemar/Soviet war?