Sorry for the bump, but I just googled for an althistory scenario on the RCW, and I stumbled upon this.
Theoretically, the Allied intervention (let's say WW1 proceeded as standard) was strongest in the Far East. Provided there was a stalemate in Siberia and Mongolia, you could see by the time of the Interwar, a modest Primorsk Republic and Mongolia headed by either Japanese puppets, Sternberg, what have you.
Now, a western stalemate could only be achieved through a Central Powers victory, ala Darkest Hour's Kaiserreich, where the Germans intervene to protect their puppet states (Ukraine, White Ruthenia, Lithuania, UBD), and allow states like Alash Orda, Turkmenistan, Don-Kuban Union, etc. to break free of Soviet and White influence.
Worst case, Russia shatters like a piece of glass, and you have a very weak "Russian Confederation" with Kerensky at the head before his death in 1936, and after his death, radicalism or moderatism is the only path (Wrangel, Denikin, Mensheviks, Bolsheviks...)