We've heard all of this before. We give North Korea money, food, and fuel, they promise to halt their nuclear activities, and once that load of goods runs out they start things up again (or, simply admit to having already done so). They're playing us like fiddles, which seems to be a common theme lately.
Perhaps when a North Korean-supplied nuke goes off in an American city, our "leadership" will finally understand that appeasement doesn't work. Not that there haven't already been plenty of examples, but it seems that it really is impossible to teach old dogs new tricks.