Secretary of State Hillary Rodham Clinton shakes hands with South Korean Foreign Minister Yu Myung-hwan at the State Department in Washington, Friday, Feb. 26, 2010. (AP Photo/Susan Walsh)

Japanese Foreign Minister Katsuya Okada, left, shakes hands with his South Korean counterpart Yu Myung-hwan after their joint press conference at the Foreign Ministry in Seoul, South Korea, Thursday, Feb. 11, 2010. (AP Photo/Ahn Young-joon)

South Korean Foreign Minister Yu Myung-hwan, right, escorts Kurt Campbell, U.S. assistant secretary of state for East Asian and Pacific Affairs, during a photo call before their meeting at Yu's office in Seoul, South Korea, Thursday, Feb. 4 ...

U.S. special envoy on North Korean human rights Robert King speaks to reporters after meeting with South Korean Foreign Minister Yu Myung-hwan at the Foreign Ministry in Seoul, South Korea, Monday, Jan. 11, 2010. King said that the human ...