Why would N Korea fire a nuclear missile against the US,  Japan or S Korea if they know that within minutes nuclear missiles would be raining down on their country in retaliation?  Worse yet if their missiles fall in the ocean way short to their targets.  Too bad, no second chance.  Hopefully Trump doesn,t start anything and open up a can of worms.  I don't think fat Kim will do anything huge, maybe small skirmishes.