Honestly, I think this is hilarious. It's North Korea, I mean, what can you do? They think they're a major threat to us, but in reality, they aren't, that's why both The United States and South Korea are not taking this threat very seriously. With it's current dictatorship that is failing in almost every way, excuse me, every way possible, North Korea is not really in the position to be threatening neither it's southern neighbor nor the U.S. The situation actually reminds me of a very popular series that I just read, "The Hunger Games" series. Here you have a country that has just been demolished by a major war almost a century prior and what remains is a corrupt dictatorship that is leading a failed nation. This is very similar to the situation in North Korea: the Korean War was a little more than 60 years ago, and now, because of a stale mate, the opposing remains of North Korea have become a country of 23 million in poverty with a young, inexperienced "leader". And don't even get me started on Kim Jung Un. I mean, have you seen the guy? He looks like baby, literally.

I am Big Baby with serious face.

I am Big Baby and I'm in charge.

I am Big Baby and I have pin with my daddy and grand-daddy on it. Cheese.
I mean, does this man even look fit to govern a nation? No. He's killing his people. Millions of North Koreans are suffering from failing health and starvation and are attempting to defect to South Korea and other free countries because this man ^^^ is a selfish, inexperienced toddler who driving the country even further into the ground all the while claiming that he is a major threat to the United States, South Korea, and the rest of the World.
Below is the link to the article that I referenced to in this post.
http://www.usatoday.com/story/news/world/2013/01/25/korea-dialogue/1863701/

