NK announced it will not attended the summit if the U.S. demands they give up their nukes per AP
I suspect they meant that they won't agree to giving up their nukes in exchange for a summit. This looks like propaganda posturing on their part and/or ensuring Trump or some other idiot won't be able to legitimately claim the NK are welshing on a deal by not committing themselves to denuclearize during the summit.
No it sounds like they are going to push Trump as far he can go in the name of getting a "win"