I don't know.
During the first Gulf war, Japan, I think, refused to allow its merchant fleet to be used to carry wartime supplies to our forces and those of our allies.
In any case Japan, in the shadow of Chinese hegemony, allowing their one significant backer keeping them from becoming a Chinese satellite to fight on their defacto behalf without their suppor is ludacris. If anything this would be exactly the opportunity Japan would relish to dogpile on China without an moral hangups.
As to the others, they either have too much interest in not pissing off china, or no real way to help in what the conflict would become.
Taiwan is not worth a war between the USA and China.. let the Chinese have it imo
![Nod](https://apolyton.net/core/images/smilies/nod.gif)
China's projected top of the line fighters for 2015 is only upto 500.
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