As a state, NK is not a threat to launch any nuclear weapons. They would simply no longer exist.
Economically, however, they are desperate. Several non state sponsored groups would pay good coin to get their hands on some of NK's weapons. Unfortunately, we will have to bribe them with more so that does not happen.
Well hopefully Russia and China would come to the reasonable conclusion that it's not in their interest to have NK nukes. Perhaps pressure can be brought to bear.