The military chiefs of the United States and South Korea said on Thursday they plan to update contingency war plans and review their combined military command while urging North Korea to return to diplomacy.

North Korea's missile and weapons developments are increasingly destabilizing for regional security, U.S. Defense Secretary Lloyd Austin said after talks with his South Korean counterpart, Suh Wook.

Austin and U.S. Army General Mark Milley, chairman of the Joint Chiefs of Staff, were in Seoul for the first such annual military talks with South Korean officials since U.S. President Joe Biden took office in January, and the last before South Korean President Moon Jae-in leaves office in May.