The only relationships megalomaniac narcissists have IS WITH THEMSELVES.
Moon is the one who needs to be made an example of.
Trump treated Moon with far more respect than he deserves In his White House visit and Moon has just publicly pissed on Trump.
Every world leader needs to understand that Trump is President and any game playing with ex President Obama will cost them dearly, starting with Moon
Our main strategic concern is North Korea's WMD and nuclear programs but there are a great many ways Trump can undermine Moon and Trump should do so.
Frankly, our concerns with North Korea are that they may be insane enough to try to attack the US directly and also that they are Iran's workshop for nuclear weapons and ballistic missile proliferation and they supply Iran (and other terrorists) with nuclear weapons that can do enormous damage to the Middle East or to Western cities. These concerns over ride any concerns about what impact our take down of North Korea may have on South Korea. Moon should be reminded of this