I doubt it, unless you call 3-5 countries against one a "world war". China is not happy with them, so I doubt anybody will actively fight along with them if they start something. I imagine the US, S. Korea, and Japan (and possibly another country or two that doesn't like them) will do to N. Korea what the coalition did to Iraq's ability to wage war pretty quick, while China and Russia denounces us in public and curses them for being stupid in private.

__________________
I love sanding.