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Having studied the Russian Empire in the 1910s I'm of the opinion that some sort of revolution, successful or not, was inevitable by the mid 20's. This would I think lead to at the very least the Finns, Balts and Poles attempting to break away and regain their independence. Indeed the Germans (and some Swedes) were encouraging the Finns to break away, going so far as offering training to separatists. In the absence of the Great War would this revolution/civil war lead to a General European War?

The treaty system would still be in place so German and presumably Austrian interference could lead to a French military response. Still would they, treaty bound or not go to war in support of an ally that is tearing itself apart, or would they content themselves with making disapproving noises and sit it out? Would Russia seek to divert the attention of its dissatisfied population from revolution by attacking Austria, Germany or the Ottoman Empire and what would be the response from France and Britain if they did? Do they support the clear aggressor their ally or sit it out?
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