there wont be a war, the plane idea is insane, no offense, creative and maybe from somewhere like Iran/Africa but still unlikely for a few reasons. One security forces find shit easier and easier especially from "Terrorist" nations or nations that breed terrorists (I.e Yemen Pakistan Qatar etc) and especially from countries like NK, they probably screen the shit out of incoming planes/ships and if there is even a slight hint of radiation theyre shut down. i dont even think korea has any large airplanes, could be wrong.
also its a scare tatic! they are desperate for food, if you look at their demands they need food. they dont have enough to feed the majority of their peoples while Kim Jong Ill or w/e is feasting.
ontop of that (this part is 100% my opinion) theyre probably tryin to act tougher so the transition from father to son will be easier and so the SKans dont invade feeling that NK is weak. Because his son is a drunk, lazy, coward, with an obsession with the ladies.