North Korea is the only country that has conducted nuclear tests in 21st century and "there is no room for any more nuclear tests" for Pyongyang -- because of increased global pressure and upgraded international monitoring systems on nuclear activities.
These remarks come from Lassina Zerbo, the executive secretary of the preparatory committee for the Comprehensive Nuclear Test Ban Treaty Organization, who's visiting Seoul for the first time since taking office.
South Korea's foreign minister Yun Byung-se also warned that Pyongyang will pay a high price from the international community if it pushes forward with a fourth nuclear test.
After its third nuclear test in February last year, Pyongyang has repeatedly threatened to conduct more.
The United Nations General Assembly adopted the Comprehensive Nuclear-Test-Ban Treaty in 1996 but it has yet to enter into force as eight of 44 nuclear technology-holder countries have not yet ratified the treaty, including the U.S. and China.
Zerbo vowed to urge Pyongyang to join the consensus on nuclear testing adding that once the treaty enters into force, the legally binding framework will stop anyone from doing a nuclear test and North Korea will be no exception.
Song Ji-sun, Arirang News.