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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
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