Trump is waiting, waiting, waiting for a REAL EXCUSE to take them out with conventional weapons (which we can do). I'm sure he's taken China's threat of interfering only if we're the first to strike. If NK does strike someplace it'll be hells bells for NK. The best time would be during one of their parades with all their generals and the fat boy in attendance. A whole bunch of drone attacks at the same time will likely put a lot of those old generals out of commission. Too bad for the collateral damage but if NK strikes first there won't be any reason we should worry about that. It'll be too late.