"When your only tool is hammer, everything looks like a nail"
Trump has bragged up that he and his administration are essentially all a bunch of deal makers.
Ok, get china to broker some high level meetings and sort this out.  North Korea is a nation ruled by a bunch of paranoids.  They are paranoid of being invaded by the west.  So, this is all about security.  Sort it out, make a deal, because Trump promised no more getting us into wars, and no more regime change.