2 years ago those nukes (which NK would be instantly obliterated for using) didn’t ‘threaten’ anyone.
I hope you’re clear that returning to the NK of 2 years ago would be no accomplishment.
I’d say the two biggest aims are limiting it’s military and opening NK up to SH, Chin and the West.
China also wants NK opened up. They planned to get that by just ending the nukes, but Trump will get real change.
A ‘throwaway’ is something worthless a negotiator creates to get a concession. I’m sure the tactic is mentioned in “The Art of The Deal”.
SK, not SH.
Top priority is the nukes...Everything else follows.