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In this April 15, 2013 photo released by the Korean Central News Agency (KCNA) and distributed in Tokyo, April 16, 2013 by the Korea News Service, North Korean leader Kim Jong Un applauds as he visits an athletics contest held by Kim Il Sung University of Politics and Kim Il Sung Military University, at a stadium in North Korea. North Korea quietly marked a second day of celebrations for its first leader's birthday and issued prickly new rhetoric Tuesday threatening retaliation for what it sees as provocations by South Korea and the United States, who have been watching closely for signs the North may go ahead with a suspected medium-range missile launch. (AP Photo/KCNA via KNS) JAPAN OUT UNTIL 14 DAYS AFTER THE DAY OF TRANSMISSION