President Lee visits Washington, D.C., to attend the Nuclear Security Summit there from April 11 to 13. The Nuclear Security Summit, the first of its kind, is convened to find a joint response to nuclear terrorism, hold relevant in-depth discussions and adopt a leaders' statement and action plans delineating concrete plans for future action.

Korean President Lee Myung-bak (center) is welcomed as he arrived at an airport in Washington D.C. on Apr. 11 (local time).