What you are saying is true SK, but NK has a nuclear bomb NOW, and not in 5 or 10 years so Japan can't really do anything about it currently.

What really is funny is the Sanctions. The Sanctions wont do anything to NK. I mean NK is a communist country, so the country doesnt really import or export. That means that the sanction wont affect it at all. The UN better think of something better to stop NK of going even crazier.