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With a PoD after the end of the civil war and before 1991, have the Romanovs return to power in Russia. Try to have this Russian Empire 2.0 keep at least the USSR's pre ww2 borders. Additionally it is preferable but not required that the restoration be the product of internal politics / conflict and not the Germans invading and installing a Tsar. Extra extra points if you restore the 1914 border.