Great scoop by @alexwardvox, but be careful -- his sources are using language in a way that seems intended to mislead. "Closure" is not a technical term, nor does it mean "dismantlement" or "tearing down" facilities.
North Korea quickly reversed the 1994 "freeze" of Yongbyon and the 2007 "disablement" of Yongbyon. In exchange for only 36 months of sanctions relief, any "closure" of Yongbyon will also be reversible. That said, I would still do this.
Sanctions relief is a perfectly reasonable way to reinforce North Korea's moratorium on nuclear explosions and IRBM/ICBM flight tests, as well as to verifiably freeze Yongbyon. While such measures fall far short of disarmament, they offer real benefits to US security.
