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North Korea's Missile Capabilities
http://www.cnn.com/interactive/2013/04/world/north-korea-missile-capabilities/

Kerry visits South Korea amid North Korea's nuclear threats
http://www.cnn.com/2013/04/11/world/asia/south-korea-kerry-trip/index.html

Timeline on North Korea's Nuclear Threats
http://www.nytimes.com/interactive/2013/02/05/world/asia/northkorea-timeline.html?ref=asia&ref=world&_r=0#/#time238_7125