With all the limitations put on Japan's military capability are they able to defend themselves without America there to help them against the North Koreans?
International Level: New Activist / Political Participation: 16 1.6%
Japan could destroy NK in a conventional fight. That is, if NK could even get there. It would take Japan a bit to gear up ad mobilize, but once that happened NK would be toast. The problem is that NK has nukes and that changes the scales. Japan could easily have nukes as well, but they don't want them. What we provide them is the ability to shoot down the nukes before they reach Japan's shores.
Japan does not want nukes on their soil because of the two cities that were devastated in WWII to put a end to their fight. NK would be a fool to provoke Japan and cause a serious issue with them. I believe if they provoke Japan, that SK and Japan would smack NK around.