IMHO there will be no deal made on this matter. Why?  Because everything is focused for the good of NK, China and Russia.  The only deal that will work is for NK to scrap their entire nuclear and missile programs.  They also would have to allow for unrestricted access and monitoring to ensure compliance of any terms agreed upon.  If an agreement cannot be reached, then it may end up being WW III.  Hope not.  Folks the "Grim Reaper" awaits patiently.