Hmmm... that is somewhat possible. But if they want to defeat China for sure, then a grand alliance should be formed. All anti-China nations should become part of this alliance. I mean countries such as Japan, South Korea, Vietnam, Philippines, India (?), Taiwan, and Malaysia (?).

In addition to this, they should create a fifth column within China, comprised of the pro-Democracy individuals and organizations. These people can be used for sabotage and ambushes.

Also, Japan.etc should bribe Russia and make sure that no supply of arms and ammunition are transported to China from Russia. (This is very important, because in normal scenario, Russia will look forward to profit from the war, by selling supplies to both the sides at inflated prices).

And most importantly, all the ICBMs of China should be destroyed in sudden attacks. Else, there is a possibility of the Chinese launching at least some of its 3,000+ nukes towards Tokyo and Seoul.