Exactly. Best case scenario is a post ww2 scenario where you force peace on China with a Soviet part, a part that is OTL Taiwan (about the same size as the communist part) and Tibet. Slice that monster up a little.Wouldn't such a union automatically Chinese dominated in a short time given the population difference (wich only will increase over time)?
Edit: the Chinese civil war of OTL was only possible because everyone was fed up with war. Now you have the ability to stop it with a less war weary population.