U.S. President Barack Obama shakes hands with South Korean President Lee Myung-bak as they arrive for a state dinner with their wives Michelle Obama and Kim Yoon-ok at the White House in Washington October 13, 2011. Obama and Lee on Thursday hailed a long-sought trade deal as an engine for job creation in both countries and presented a united front in the North Korean nuclear standoff. REUTERS/Hyungwon Kang (UNITED STATES - Tags: POLITICS TPX IMAGES OF THE DAY)