The best way to punish the N. Korean government is to inform the people where the food is coming from - currently all humanitarian aid with US or other international flags on it has those symbols removed so that the people think that the food is coming from the North Korean government. That aid is what's keeping the N. Korean population from almost starving to death. So instead of handing over that aid to the N. Korean government, para-drop it over populated areas as needed with propaganda pamphlets telling the people what's really going on in their government. Don't stop until the N. Korean government either collapses or bends to our will.
Or, we can launch missles over N. Korea, scare the crap out of the little man when he sees them coming, and then really scare him when the missles open up with all the rice the N. Koreans could eat. hahaha