South Korea’s national security adviser and his new U.S. counterpart met for the first time on Thursday, reaffirming their commitment to the “complete denuclearization of North Korea” even as Donald Trump’s return raises questions about the U.S. commitment to Seoul’s defense.

South Korea’s Shin Won-sik and U.S. National Security Advisor Mike Waltz discussed the U.S.-ROK alliance, North Korea issues, trilateral cooperation with Japan and other issues during their meeting in Washington, according to a press release from Seoul’s Presidential Office on Friday.