✔ 最佳答案
No, they will simply start installing Patriot and Aegis anti missile systems all around North Korea. Station several Guided Missile Destroyers in the Sea of Japan. If a North Korean Missile even looks like it's headed for Japan, take it out. I suspect at that moment China will act, they really have no choice, they have to much invested in trade with the west to let the North Koreans mess it up and start a war.