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By James Pearson and Ju-min Park SEOUL (Reuters) - U.S. ambassador to South Korea Mark Lippert underwent two-and-a-half hours of surgery after he was slashed in the face by a Korean nationalist in an attack at a breakfast forum in Seoul on Thursday to discuss Korean reunification. In 2010, Kim tried to attack the Japanese ambassador to South Korea by throwing a piece of concrete and was given a suspended jail term, according to police. The attack was a protest against joint military exercises by South Korean and U.S. troops, which Kim said interfered with reconciliation between North and South Korea, according to police following an interrogation. U.S. President Barack Obama called Lippert to wish him a speedy recovery, a White House official said.