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Suppose that the Molotov-Ribbentrop Pact goes roughly similar to OTL. The only difference being, that the Soviet Union decides to beat the Germans at their own game and invade Poland a week before the German's planned invasion. This leaves Hitler furious, who then orders the Wehrmacht to seize as much of Poland as it can, with the Germans and Soviets meeting just East of Danzig, along a Gdansk, Lodz and Krakow line. Now, since the Soviet Union invaded first in this scenario, would the British declare war on the Soviet Union? Could the Germans make it seem like they're coming to Poland's aid, and thus avoid a similar DoW? This would almost certainly butterfly away any aid and Lend Lease for the Soviet Union, and we could even see Operation Pike take place should Britain declare war on Germany too. What butterflies would this mean for Finland and the Winter War? Could we see the Germans arming the Polish POWs out of spite, and sending them to Finland to fight the Soviet Union? What about both the Germans and the British working together to help Finland? Also, could Germany spin things so as to be seen as coming to Poland's rescue? And could the British really take on both the Soviet Union and Germany at the same time? The Middle East could very well end up heating up much earlier here. Lastly, what would Japan do in such a situation? The Battles of Khalkhyn Gol would be wrapping up around the same time as the Molotov-Ribbentrop Pact is signed, but would Japan try for revenge against a Soviet Union at war with Britain and Nazi Germany?
I realize that's a lot of questions, and that most of you could probably find more holes in that than Swiss cheese, but it was something that occurred to me yesterday so I figured I'd share.