26 March: South Korean warship, Cheonan, sinks, killing 46 sailors. 20 May: Panel says a North Korean torpedo sank the ship; Pyongyang denies involvement. July-September: South Korea and US hold military exercises; US places more sanctions on Pyongyang. 29 September: North holds rare party congress seen as part of father-to-son succession move. 29 October: Troops from North and South Korea exchange fire across the land border. 12 November: North Korea shows US scientist new - undeclared - uranium enrichment facility. 23 November: North shells island of Yeonpyeong, killing at least four South Koreans . 27 Nov-1 Dec: South Korea and US hold joint military drills. 6-12 Dec: South Korea stages live-fire military exercises
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