It is also unclear what concessions Pyongyang could demand in return... NONE, NO CONCESSIONS FROM Pres. Donald John Trump!
I think they may have this in mind.
;)
https://www.express.co.uk/news/world/952749/kim-jong-un-north-korea-mcdonalds-donald-trump-usa
I’d give him one: Him, his immediate family and his 100 top followers can go and live in luxury villas in China while Moon reunifies the country and mines all that mineral wealth.
There are some things the US can and should do
You can call them concessions. I call it putting the defense of SoKo in their hands