Japan is slowly giving up the Constitutional obligations of not having an offensive capable armed forces or exporting weaponry. There is no doubt that historically Japan has overlorded China and Korea. Therefore, notwithstanding being allies or having close and dependent economic ties, there are grounds of not quite 'being there'. There is always the undercurrent of rivalry amongst all three and jockeying. However, despite the differences, is there a chance of armed confrontation? If there is an armed confrontation, how will it affect the US and the rest of Asia?