** FILE ** South Korean President Lee Myung-bak has a briefing with the Joint Chiefs of Staff in Seoul on Tuesday, Nov. 23, 2010, as the military was put on top alert after North Korea's artillery attack on the South Korean island of Yeonpyeong. (AP Photo/Yonhap, File)

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** FILE ** South Korean President Lee Myung-bak has a briefing with the Joint Chiefs of Staff in Seoul on Tuesday, Nov. 23, 2010, as the military was put on top alert after North Korea's artillery attack on the South Korean island of Yeonpyeong. (AP Photo/Yonhap, File)