My guess is that the whole idea of this has more to do with shifting the news cycle then any sort of actual diplomatic goals on our part, other than Trump wants to hold up something that says “I won”.
From seeing the negotiations on everything Trump has tried in the last year, it’s very clear Trump values The appearance of doing something much much more than he cares about what that thing does, or if it is good or bad.
And no one in their right mind would negotiate with him in good face anyway, because he shown time and time again that he is completely untrustworthy and won’t necessarily follow through on his word.
It’s not even clear he could get the Senate to ratify any deal he put together.
"So uh, nukes uh"
"How are you people staying in shape so well, must be one hell of a DIET hahahahah!"
"Yeah, well we could do something about the sanctions but what will you do in return?"
"Give up the nukes? Nope, that won't do, than who do I threaten to blow up?"
"Well the sanctions haven't impacted your sister I see

Don't you like that sis, she's pretty hot right?"
"KIM JONG UN OFFENDED AFTER TRUMP CALLS HIS SISTER HOT DECLARES WAR ON US IMMEDIATELY AFTER HISTORIC TRUMP/KIM SUMMIT"
"WOLF BLITZER HAS HEART ATTACK AFTER SCREAMING "GOD MAKE IT STOP" LIVE ON AIR"