North Korean leader Kim Jong-un
Media playback is unsupported on your device

Life inside North Korea's secret state

15 February 2013 Last updated at 04:14 GMT

President Obama has threatened to take firm action against the government in Pyongyang.

His comments come as the UN Security Council debates its response to North Korea's third nuclear test, carried out earlier this week.

Lucy Williamson, reporting from Seoul, looks at what the nuclear programme means to those inside North Korea.