President Barack Obama walks with Russian President Dimitry Medvedev, left, and French President Nicolas Sarkozy, right, at the NATO Summit in Lisbon, Portugal
President Barack Obama talks on the phone with President Lee Myung-bak of South Korea in the Treaty Room Office in the White House residence, Nov. 23, 2010. Earlier in the day, North Korea conducted an artillery attack against the South Korean island of Yeonpyeong.