Warnings of N Korea's nuclear developments

North Korea has threatened to take unspecified stronger measures in response to recent international sanctions after it successfully launched a satellite into space in December.

Pyongyang warns the action could exceed a promised nuclear test, which it had said would target its "enemy", the United States.

The heightened rhetoric comes as a US scientist says North Korea could be close to a nuclear weapons breakthrough.

Al Jazeera's Harry Fawcett reports from Seoul.

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