I agree with DCL more or less. Don't let the media blow this up for you guys. North Korea is years away from even being able to launch a nuclear warhead with a missile. They are not stupid enough to utilize their weapons in a real and legitimate threat.
I mean, can you imagine who would be in that "war"? The world vs. NK and Iran?
It's important to keep an eye on their activities but they are NOT a legitimate threat. They're a political machine concerned more with internal domestic affairs. They have starving people and a crippled economy.