The only diplomatic coup there will be is when North Korea is verifiably free of nukes, missile delivery systems, plutonium, uranium and their top scientists have been bought off and removed, or outright eliminated. The only Agreement that will be valid will be one signed with a regime that is not of the Kim Family in any fashion whatsoever or the Korean Workers Party. In short, this is a lot of celebrating over optics only and is entirely premature and highly inappropriate.
His talks will fail.
And will do so with days or weeks of this meeting. It is a forgone conclusion because NO AGREEMENT with the regime will be honored.
Well gee then
Lets just continue the status quo
With continuing nuclear escalation