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We all know that in OTL Mongolia was so dependent from the Soviet Union that it almost counted as a Soviet Republic.
What should have happened if we 're to have a Mongolian SSR to become a reality? And what might be the consequences if the USSR had a larger Border with the PRC?
And when would have been the best POD for this? During the Interwar era? WW2? Or during the Sino-Soviet Split?