No. The potential for a disaster involving us and China is too great. The country has weapons, we have defenses against those weapons, and we can handily beat them in an arms race should they choose to go that route. Let the guy feel safe with his one missile, eventually he'll get old, slip on a banana, eat some bad chicken, etc and die. The next guy will be more sane.
Per your other thread, I would support assassinating him if we could do it reliably/covertly. Having a more stable person at the head of North Korea would be a good thing.