IS and NK are equally insane.
Kim is just doing the usual scare mongering tactics with his shitty soviet missiles.
Well, actually NK recently did quite a lot of research and development on those rockets and probably they got some know-how from China,
so some of those missiles are more or less up to date stuff. Anyway, currently none of those missiles can reach densely populated areas in the US.
Facts don't confirm that their rocket technology is "up to date". The two stages of the rocket launched in 2012 were examined by Korean missile experts. They reported that the components of the rocket were unreliable and inefficient, the rocket design being based on older technologies from the 1960s and 70s, whereas the rocket engine was almost identical to the Iranian one (don't ask me where they got the Iranian rocket engine from).