I agree with Kichwa Trump has little to do with this which is driven by: 1) China and 2)Timing - Kim Jong-Un now has an arsenal to trade. Very likely Kim will insist on remaining "nondescript" nuclear power like Israel.
The real place where US has interest, influence and history to resolve is Israel-Palestine. No hope in sight... although Trump is right we should have an autonomous Palestine-Sinai on the peninsula south of Alexandria.
But the difference is the same and Trump, Xi Jin Ping, Kim Jong-Un and Moon will get a Nobel for this.