Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US Defense Secretary Vows Close Collaboration with South Korea Carla Babb SEOUL - U.S. Defense Secretary Mark Esper said Friday the U.S. and South Korea share a "vision of a peaceful" Korean Peninsula and declared the two allies would keep collaborating on North Korea and other issues. On his first international trip since being confirmed last month, Esper addressed the media in Seoul after meeting with South Korean counterpart Jeong Kyeong-doo amid heightened regional tensions. Esper said the Washington-Seoul alliance is "ironclad" and the "linchpin of peace and security" in Southeast Asia. He added the two allies would ensure the "readiness of our combined forces to defend ourselves while also creating space for diplomacy." .