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Arms kerfuffle? Missiles. Need food aid? Missiles. No one is paying attention to your rat-fucked country? Believe it or not, missiles.
One of these days they are going to screw up an hit Japan. It will not go well for them. >

This would be a good time to remind Kim that Japan and US have a mutual defense agreement that commits each other to come to the others aid if attacked by a foreign nation. 
The US’ military support for defending Japan would dwarf anything we’ve seen with Ukraine. >

Japan could handle NK easy by itself >

Japan could handle China by themselves >

As long as there wasn’t a huge ground war yes. China is unproven and Japan basically is at this point now. If no ground war is involved I agree >

Yes, but Japanese military tradition, tactics, and budget was gutted for a looooong time after the obvious. Who knows if they will still be that same terrifying force. Same goes for Germany >

Ah no worries Japan’s navy is stacked