South Korean President Moon Jae-in and U.S. President-elect Joe Biden discussed North Korea denuclearization by phone on Thursday morning, vowing to meet up as soon as possible, according to Seoul’s presidential Blue House.

The two leaders started talking around 9 a.m. KST and spoke for about 14 minutes in total, the Blue House said. During the call, Biden told Moon that he will “closely cooperate [with South Korea] to solve the North Korean nuclear issue,” Blue House Spokesperson Kang Min-seok told reporters on Thursday.