Stalin started the Korean war and he ordered Mao to fight and die for the war started by him. Mao had to do that cos Mao owed Soviet a huge debt.China was/is in the first place to fight against the enemy invading Korea and Vietnam, even in the last years of Qing dynasty.
Thats why if Chiang won, then millions Cnese didnt have to fight and die for the war started by Soviet.
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MOSCOW (AP) _ Two American historians said Wednesday they have found proof in newly opened Soviet archives that Josef Stalin approved the North Korean attack that began the Korean War in 1950
https://apnews.com/adf271706570fbe753e6783955675e60