"Trump-Kim Summit: From Yongbyon Site to Sanctions, What Each Side May Bring to the Table" by Simon Denyer for The Washington Post

"But the devil will be in the details, argues Melissa Hanham of the One Earth Future foundation: Which facilities would North Korea offer to close, what access would inspectors get, and would any closure be permanent and essentially irreversible? The main reactor at Yongbyon has been shut down twice before under previous deals, but North Korea's nuclear program has started up again later. This time the United States would want a more robust closure."