Top officials from the U.S. and South Korea vowed to prioritize North Korean nuclear and ballistic missile issues on Thursday.

Earlier this week, U.S. Secretary of State Antony Blinken and U.S. Secretary of Defense Lloyd Austin touched down in South Korea for their first-ever visit under their new titles. After meeting with South Korean foreign minister Chung Eui-Yong and defense minister Suh Wook, both countries released a joint statement stressing the importance of having a “stable presence” of U.S. forces in South Korea, as well as the importance of implementing U.N. Security Council resolutions — many of which are meant to stop North Korea’s nuclear program from advancing.