They do this every single time there is a new American president, flex their mussles, make demands, keep pissing people off until those demands are met. Then they shutup, go away, and sell more soviet-era technologies/secrets they inherited to other nutzo countrys (IE: Iran).
Honestly, I'm not more concerend about N. Korea because of this than I was when I first learned about modern-day N. Korea. And I doubt N. Korea will actualy launch anything unless one of the major world powers doesn't cough up some money or "humanitarian aid" for their collapsing country. IMO we should just ignore them until they finaly jsut piss off China (and as far as I'm concerned, if they want ot take over N. Korea, China can't possibley make things any worse than they are now).
And think about this, what was the last thing, besides the Bejing Olympics, that got America's diplomatic "attention" in that part of the world. I remember a few years ago China's space agency was kicking into high gear and our country wasn't very happy about all the stuff they were shooting up and high into the sky. So now it's about that time (every 4 or 8 years) for N. Korea to make a new stink to get Obama's attention, and what is it that they're doing? Picking something they know got our attention in that part of the world recently and picking something that they are 99% sure China will either support them in what they're doing or keep their mouths shut about it and let them continue to push our button until we give N. Korea something they want.