This scenario is somewhat similar to one of my previous questions here. Anyway, though, here goes:
What if the Bolsheviks--either under Lenin or in the early Stalin years--would have had the Russian SFSR annex both the Ukrainian and the Byelorussian SSR? Basically, the reason for this is that the Bolsheviks would have come to the conclusion that the East Slavic proletariat need to be put into one country and become one people so that they can devote their exclusive focus and attention to fighting predatory bourgeois imperialism.
Also, if the Soviet Union still eventually annexes Galicia in this TL, Galicia also gets annexed to the Russian SFSR right afterwards.
Anyway, what about the consequences of this be? Would the Bolsheviks have succeeded in Russifying Belarus and most of Ukraine like they did with the Kuban? Or would the Bolsheviks' move here only result in the weakening of the Russian SFSR due to its annexation of many non-Russians and its inability to assimilate them?
Also, how exactly would this affect the breakup of the Soviet Union several decades later?
Any thoughts on all of this?