North Korea is that crazy hobo you keep giving cheeseburgers so he won't stab you when you walk by him. There's only a tiny chance he'd nick you with his dirty hobo razor, but you feel safer for having placated him.
The downside is if he, despite being bat**** crazy, learns that threatening people to get cheeseburgers is a great way to avoid having to provide for himself, which is pretty much what happened to North Korea.
There'll be lots of negotiations that don't involve statements like "stop building bombs and we'll feed you" but that's really what it will amount to. North Korea might have decided that getting cheeseburgers was a low-ball offer and now it wants fries and a coke too, and in a year or two they'll probably get it.