[Htsthbjig]

I have lived in China, Korea and Japan and in my opinion you are not right.

Fist, US of America is requesting Japan to do what is has done. They are worried about China, not Japan. Also the Philippines, Malaysia, Taiwan and Vietnam want Japan involvement.

Japan today is a very old country which population is going to decrease in dozens of millions in the next decades.

By contrast China has a population more than 10 times bigger than Japan, but now they are industrialized, they can sustain a war, and could kill millions.

US wants to maintain control trade on China sea. Preserve the status quo(as WWII winner). Of course China wants to change the status quo, control her own sea, and if possible, dominate others(like the US does).