The President called President Lee Myung-bak of the Republic of Korea today to offer his support and condolences following the sinking of the South Korean Navy vessel Cheonan on March 26. The President told President Lee that the thoughts and prayers of the American people are with the families of those missing and with the family of the South Korean Navy diver who died trying to rescue them. The President noted that the US Navy had extended assistance to South Korea’s ongoing search and recovery effort and said we were prepared to provide further help if needed. They also discussed the upcoming Nuclear Security Summit in Washington, DC on April 12-13.
Barack Obama, Readout of the President's Call with President Lee Myung-bak of the Republic of Korea Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/290483