South Korean President Lee Myung-bak, center, arrives with Defense Minister Kim Tae-young, second right, at the Joint Chiefs of Staff as the military was put on top alert after North Korea's artillery attack on South Korean island of Yeonpyeong, in Seoul, South Korea, Tuesday, Nov. 23, 2010. (AP Photo/Yonhap)

South Korean President Lee Myung-bak, center, arrives with Defense Minister Kim Tae-young, second right, at the Joint Chiefs of Staff as the military was put on top alert after North Korea's artillery attack on South Korean island of Yeonpyeong, in Seoul, South Korea, Tuesday, Nov. 23, 2010. (AP Photo/Yonhap)