How balkanised are we talking here? Cause one could argue that Russia did balkanize, at least partially, during the Russian Civil war. SO how about a more successful Allied intervention and White movement, not a total victory mind you, that leads to the Whites fleeing to the Far east and creating their own state, supported by the Allies and similar to the Korean situation today, with both claiming to be the legitimate Russia. And the other states, such as Ukraine and Belarus gain, their independence. Or something to that effect.