Protest leaflets and machinegun bursts sour relations between North and South Korea. Fauziah Ibrahim speaks to Robert Kelly, a professor of Political Science and Diplomacy at Pusan National University; John Everard, a former UK ambassador to North Korea and former co-ordinator of a panel of experts on North Korea at the United Nations; and Moon Chung-in - a professor of political science at Yonsei University and former advisor to South Korean presidents Kim Dae-jung and Roh Moo-hyun.