Pro-North Korean protesters sit near a placard bearing pictures of South Korean President Lee Myung-bak, left, U.S. President Barack Obama, center, and Japanese Prime Minister Taro Aso during a rally to oppose the Proliferation Security Initiative, a U.S.-led program aimed at halting the spread of weapons of mass destruction, and international sanctions against North Korea near the U.S. Embassy in Seoul, South Korea, Tuesday, April 14, 2009. North Korea vowed Tuesday to bolster its nuclear deterrent and boycott six-party talks aimed at its denuclearization in protest of a U.N. Security Council statement condemning the country's recent rocket launc
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