moon, the secretary-general of the United Nations, said in a statement referring to the test. The United Nations Security Council will meet in New York on Tuesday morning to discuss the development, a security council diplomat said. Japanese Prime Minister Shinzo Abe said the test was "extremely regrettable," adding that Tokyo would "strongly" protest it. Kim Min-seok, a spokesman for the South Korean defense ministry, said the magnitude of the "artificial tremor" suggested the size of the blast could be in the order of 6 to 7 kilotons, more powerful than the North's two prior nuclear tests.
