Japan, China diplomats affirm 'resolute' response to N Korea

bomb their missile sites... problem solved

Japan will be influenced to a large extent by the American policy. The prominent American statesman John Bolton, formerly the ambassador to the UN, has defined the purpose of the forthcoming Second Korean War (KWII) as putting an end to the existence of North Korea. Indeed, the American strategic patience towards that existence has expired, because enough is enough. The forthcoming KWII will apparently consist of two phases: The conventional phase and the nuclear phase. The nuclear phase will probably begin with erasing Pyongyang city from the face of the earth. However, after that event North Korea may retain some residual capability to respond. That moment might be dangerous for Japan.

I don't think there will be a KWIII. The outcome is obvious, regardless of how much "retaiiation" NKorea is capable of, it will end with the Korean Peninsula unified under SKorea, and US troops right up to the Chinese border. China will pressure NKorea, failing which it will probably rather invade NKorea itself rather than face the inevitable. China has and always will act in it's own interests, and this time is no different.