North Korea has been stepping up its hostile moves. It has even threatened to launch nuclear missile attacks on Guam, the continental United States and Seoul as well as three areas in Japan hosting U.S. military bases — Misawa, Yokosuka and Okinawa. Its behavior defies common sense.

The international community must strictly monitor its actions and deepen cooperation among its members to dissuade the North from starting a harmful action.

The North abrogated a nonaggression pact with South Korea on March 8 hours before tough United Nations-imposed sanctions against it took effect. The North announced March 11 that the 1953 Korean War armistice was null and void. It declared March 30 that it had entered a "state of war" with South Korea.