Plausibility Check: East Asian War

In a war between China and North Korea against Japan, South Korea, Taiwan and Mongolia, do the second have the possiblity to win? No foreign intervention, only support.
I know, it sounds like something to ask on Yahoo Answers, but it's some time i'm wondering about this.
 
I don't think this scenario is really plausible (obviously the US would be involved), but here's what would happen. Mongolia's a lost cause, since their army is small and they're isolated from the others, but Taiwan and South Korea are well-prepared. North Korea's army is impressive but will fall apart in a serious war against the South and only be sustained by Chinese assistance. Japan will need a while to get mobilised for war compared to Taiwan and South Korea, but will be more than capable of aiding South Korea and Taiwan when needed because of high population and how they already have one of the world's largest navies (although admittedly, the PRC Navy is almost twice as large by tonnage as South Korea, Japan, and Taiwan combined).

Best-case scenario for China is they either conquer Taiwan or help North Korea conquer the South. I don't think they could do both in the same war, and doing both AND invading Japan is probably beyond the question. Similarly, the capitalists could reunify Korea, but anything operations beyond that into China is only there to end the war on their terms. Taiwan isn't going to be able to reunify China under them.

But yes, South Korea/Taiwan/Japan victory is definitely plausible. I also wonder what Russia would do in this case.
 
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