North Korea and Iran are both relatively small nation states capable and interested in building this type of missile system. North Korea would like to end its stalemate with South Korea whether the US was there or not. In Iran's case it is to attack a country some distance away with which it shares no borders.
The model works well here too - break each of them up into smaller units until they no longer present a threat.
Both groups of people would be much better off without 'their' States.