[countryslicker]

China would intervene for very good reasons.

NK is an ongoing humanitarian disaster right now. At the moment, everybody is standing by blaming the NK regime for not acting to resolve it. If you remove the regime, the crisis gets much worse. If you bomb the country, the crisis gets much, much worse.

When you are done bombing the snot out of NK, who will pick up the pieces? Who will be on the hook for millions of starving people? Who will be the neighbor that gets slammed by the masses of humanity in desperation?

You think China hasn't thought about all this? You think they won't automatically recognize the obvious and enormous threat to themselves? Every missile that lands in NK is a direct threat to China.