NK's geographic position is interesting. Unless US boat is launching east from PRC's Yellow / Bohai sea / PLAN bastion, there isn't a trajectory to NK that does

NK's geographic position is interesting. Unless US boat is launching east from PRC's Yellow / Bohai sea / PLAN bastion, there isn't a trajectory to NK that doesn't look like it's heading towards PRC mainland. And even then, unless timed during summer months, prevailing winds is going to push fallout / radiation towards BJ. During winter downwind will drift to SKR / JP / east coast PRC. I don't know what proportional counter retaliation is, maybe a few nukes off CONUS west coast urban centres, but PRC isn't going to sit there and eat incidental radiation over major population centres even if target is NK.