New U.S. Secretary of State John Kerry and his South Korean counterpart have agreed to make sure North Korea is punished if it carries out its threat to conduct a nuclear test.Amid signs that such a test is coming, South Korea’s president also speculated that Pyongyang may detonate multiple atomic devices simultaneously.

Under a U.N. Security Council resolution last month condemning a North Korean long-range rocket launch that the U.N. and others call a disguised test of banned missile technology, Pyongyang is subject to new sanctions if it detonates its third nuclear device since 2006.

North Korea announced last month that it will conduct a nuclear test to protest the toughened sanctions. During a phone conversation between Kerry and South Korean Foreign Minister Kim Sung—hwan, “there was agreement that ... if the DPRK continues its provocative behavior and takes further steps, that there must be further consequences,” State Department spokeswoman said.AFP