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This undated picture released from North Korea's official Korean Central news Agency on November 27, 2012 shows North Korean leader Kim Jong-Un (C) during a photo session with participants in the national meeting of chiefs of branch social security stations at an undisclosed location in North Korea.  AFP PHOTO / KCNA via KNS ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS        (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This undated picture released from North Korea's official Korean Central news Agency on November 27, 2012 shows North Korean leader Kim Jong-Un (C) during a photo session with participants in the national meeting of chiefs of branch social security stations at an undisclosed location in North Korea.  AFP PHOTO / KCNA via KNS ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS        (Photo credit should read KCNA VIA KNS/AFP/Getty Images)

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South Korea warns of 'strong response'

CNN's Kyung Lah reports on South Korea's response to North Korea's increasingly hostile rhetoric.

South Korea warns of 'strong response'

CNN's Kyung Lah reports on South Korea's response to North Korea's increasingly hostile rhetoric.