SEOUL, South Korea -- North Korea's state news agency says leader Kim Jong Un has vowed at a meeting of top security and foreign officials to take "substantial and high-profile important state measures."

Analysts say the pledge is a sign that North Korea plans to conduct a nuclear test on Kim's orders.

North Korea's powerful National Defence Commission declared last week that the country would carry out a nuclear test and launch more rockets in defiance of the U.N. Security Council. The U.N. punished North Korea for a long-range rocket test in December with more sanctions, calling it a violation of a ban on nuclear and missile activity.

The official Korean Central News Agency reported Sunday that Kim convened top security officials and diplomats in Pyongyang to pledge to take action.