@gollum,
(reposting in reply to Gollum)
I don't think North Korea wants to get into an actual shooting war. I think what it wants is to be able to sit at the same table with the other nuclear powers and to be treated as such. This is the same thing Iran (and a few others) want.
The challenge they face is that you don't want to scare everyone at the table before asking if you can sit down. The people sitting at the table with the big guns are already on edge worrying about trusting their "friends", so none of them like to see a Wild Eyed Willie barge in shouting about his loaded gun and demanding to join them. That type of entrance can get you summarily shot.
So my guess is that "Dear Leader" is trying to figure out a way to force open a seat at the table without getting shot. Brinkmanship.