A South Korean marine sits on a K-55 self-propelled Howitzer during an exercise against possible attacks by North Korea near the border village of Panmunjom in Paju, South Korea  Monday, April 1, 2013. After weeks of war-like rhetoric, North Korean leader Kim Jong Un gathered legislators Monday for an annual spring parliamentary session taking place one day after top party officials adopted a statement declaring building nuclear weapons and the economy the nation’s top priorities. (AP Photo/Ahn Young-joon)