I think I saw a picture of Hillary Clinton yawning when she heard this.
This has worked for them in the past, the saber-rattlings and shrill threats, so it's no surprise that they are at it again; if you are a puffer fish, you puff up when you sense danger, but you have to wonder about the sanity of those in charge in that benighted land. Yes, the United States is pretty busy in the ongoing-war department these days, but don't the North Koreans have a clue as to what will happen if they actually throw one of their nukes at a U.S. warship?
Does nobody remember what happened to Saddam's WWI-era troop lines when the U.S. stomped into Iraq? Airplanes? Smart bombs?
Tactical nukes, if necessary?
Can't anybody understand the term "radioactive crater where North Korea used to be" in that part of the world? Or maybe just "radioactive crater where the secure Presidental bunker used to be?"
It's talk, of course, it allows them to seem brave (and reeealllly stupid) in the giant's face. Still, if they ever actually do something, it could be reeeallly bad for them ...