Ever since former U.S. President Donald Trump walked out on North Korean leader Kim Jong Un at the Hanoi Summit nearly two years ago, negotiations with Pyongyang have largely fallen into a diplomatic deadlock.

But with a new president freshly inaugurated into the White House, South Korean President Moon Jae-in is now calling on his American ally to help undo that damage. On Thursday, Moon vowed to work closely with President Joe Biden to resume denuclearization talks, and he also asked top South Korean officials to make a “proactive” last-ditch effort to save relations with the DPRK.