That’s what people used to say about China.
We have no credible evidence that Nork can launch an intercontinental bottle rocket, or that they have anything close to an H-bomb in their arsenal. And even if they could manage to get something off the launch pad, I suspect we, the Russians, and/or the Chinese would shoot it down before it got higher than a child's kite.
Which is not to say that Uncle Kim isn't stupid enough to try something like that. It's just that the repercussions of an unprovoked attack on the US are so catastrophic that either outcome -- success or failure -- would seal his fate. Not even obama is so big a pussy he would not strike back.