AHC: Soviet China

How could the Soviet Union include, most if not all, of China? Could it happen with a POD during WW2, or is that too late?

Would they move their capital closer to China?
 
No in short. Part of Maos appeal was removing foreign influence from china and the USSR didn't want to dominated by the Chinese. Parts of china maybe but not the whole lot neither side wanted that.
 
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