Soviet is a reason Jap stop raping and slaughterring Cnese sex slaves in Nanjing. Mao had to keep begging help from Stalin just for taking back Xinjiang.
Without Stalin help, Mao's long march would be a dead march to hell.
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What did the Soviet Union do to help? First, it provided the means of transportation that allowed for a speedy invasion. In late September 1949, Mao issued a
desperate plea for assistance to Stalin: “the railroads in this region are poor, the conditions difficult, there are few people, and there is no food,” he wrote. “We acutely need and hope that you will help us with 30-50 transport aircraft to ship food, clothing, key personnel, and some of the troops.”
What if such assistance was not forthcoming? Mao warned that he would have to delay his invasion until March-April 1950. “This would be detrimental to the solution of the Xinjiang problem.” Stalin agreed. He volunteered the requested airplanes.
Second, the Soviet Union provided other supplies that were crucial to the PLA’s invasion. After Stalin loaned the aircraft, Mao asked for
aviation fuel. “We are encountering great difficulty in this matter.” Once again, Stalin
pledged his support.
Food was one of the most vexing problems for the Chinese armed forces. The PLA needed huge amounts of grain and other foodstuffs to feed its 90,000 men involved in the invasion, but it hesitated to requisition too much food from the local population in Xinjiang. Commander Peng Dehuai understood that it would be a public relations disaster—one that could spark local resistance—if the new Chinese army was perceived as an occupying force in Xinjiang. So, again, Mao asked his
Soviet friends for help: this time, for
10,000 tons of grain. Stalin consented.
https://www.wilsoncenter.org/blog-p...hinese-communist-party-to-power-xinjiang-1949