The North Korea threatened the United States in 2013. This threat came about after a test was conducted nuclear weapon and the results came out positive. The threat was not only to the US but also to its Asian neighbors.
yeah it's not new that they have been threatening us, its the fact that it looks like they are preparing for a war. but if anything happens i can almost promise that the UN, south korea, japan, and a couple more countries will raise their arms at north korea.