A pro-unification activist holds a banner at a rally against the U.S.-led Proliferation Security Initiative (PSI) operation in front of U.S. embassy in Seoul October 12, 2006. The PSI is aimed at interdicting Pyongyang?s suspected transport of banned materials through sea lanes. The slogan reads, 'Opposing U.S. pressure on South Korea to join PSI operation' REUTERS/You Sung-Ho (SOUTH KOREA)