South Korean conservative activists march as they hold cutouts of North Korea's late leader Kim Il Sung, left, and current leader Kim Jong Il during a rally denouncing North's nuclear program in Seoul, South Korea, Thursday, June 25, 2009. North Korea vowed Thursday to enlarge its atomic arsenal and warned of a "fire shower of nuclear retaliation" in the event of any U.S. attack, as the regime marked the 1950 outbreak of the Korean War amid heightened tensions. Kim Jong Il cutout reads: "Out, Kim Jong Il and Kim Jong Un." AP Photo logo AP Photo 4 months ago

South Korean conservative activists march as they hold cutouts of North Korea's late leader Kim Il Sung, left, and current leader Kim Jong Il during a rally denouncing North's nuclear program in Seoul, South Korea, Thursday, June 25, 2009. North Korea vowed Thursday to enlarge its atomic arsenal and warned of a "fire shower of nuclear retaliation" in the event of any U.S. attack, as the regime marked the 1950 outbreak of the Korean War amid heightened tensions. Kim Jong Il cutout reads: "Out, Kim Jong Il and Kim Jong Un."