Japan is loved by many Western nations but in Asia the feelings are quiet different. The Chinese, Filipino, Taiwanese, N.Korean and other all have a bone to pick with Japan's WW2 crimes and its sexual slavery during WW2. On a row between S.Korea and Japan, the NKoreans will side with their Southern borthers ( they are infact the same people but divided by ideology. A reunification Of Korea could become a torn in Japan's side. There are historical hostilities and growing economic frictions between Japan and Korea which are the basis of
Japanese attitudes on the prospects of Korean unification. For the first fifty years of the century Japan occupied and exploited the Korean Peninsula leaving strong negative cultural biases and attitudes in the region.
Asia is an unstable region, the Thai's are going through regime change and Dokdo/Takeshima could become the next Falklands. All you need is one right-winger to start pulling a trigger.