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The idea is that with a late 1920s PoD the soviet Union falls into civil war again by 1932, but the question is not only how the civil war happens, but also how the neighbours react, for example, Poland could try to take over Ukraine and the Finns could try to snatch Karelia, and also which groups would be fighting. At least one of the groups must want the Tsar back, even if it is under the concept of a germanic monarchy, with the Tsar having a lot of power but with a active parliament (because absolutism is pretty much dead). Which separatist groups could rise? Could the pro soviet side break into different interpretations of marxism?
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