A middle school student cleans the gravestones of soldiers who died in the 1950-1953 Korean War at the national cemetery in Seoul June 4, 2009, ahead of the country's 54th Memorial Day on June 6 to commemorate fallen patriots. Russia has suggested that it may back economic sanctions against North Korea to persuade Pyongyang to scrap its nuclear arms program, while fears grew that the North is about to test another long-range missile. REUTERS/Jo Yong-Hak (SOUTH KOREA POLITICS MILITARY EDUCATION)