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First off, let's ignore all the modern-day borders and imagine Russia as it once was in 1917.
How plausible is it for a divided Russia like the above to form, with a socialist or communist "Red" Russia holding the west and it's industries, and an eastern "Romanov" Russia headed by a member of the imperial family?
Where would their capitals be? And where would their borders be? In or around the Yenisei River, or with a possible northern extension around the Talmyr Peninsula? Or somewhere else entirely?