The U.N. Security Council unanimously approved new sanctions Monday following North Korea's sixth and strongest nuclear test on September 3.
The Nuclear Safety and Security Commission said its land-based xenon detector in the northeastern part of the country found traces of xenon-133 isotope on nine occasions, while its mobile equipment off the country's east coast detected traces of the isotope four times.
Xenon is a naturally occurring, colorless gas that is used in manufacturing of some sorts of lights.
Punggye-ri in Kilju County, North Hamgyong province, is North Korea's only known nuclear test site.
In a statement, North Korea responded by calling the actions "state terrorism" and that the "chief culprit" involved in "cooking up the "sanctions resolution", be beaten to death with a stick fit for a rabid dog".
The recent nuclear test was the sixth and most powerful test North Korea has conducted since its first in 2006.
Analysts for 38 North, who are devoted to reporting on the regime, believe this activity may indicate that preparation for future tests in other underground portals is underway. He has now visited North Korea 32 times as part of his "sports exchanges" between Japan and North Korea, which have no formal diplomatic ties.
North Korea threatened to use a nuclear weapon against Japan and turn the USA into "ashes and darkness" for agreeing on fresh United Nations sanctions this week - rhetoric that is likely to exacerbate tensions in North Asia.
Pyongyang claims it detonated a hydrogen bomb in this latest test, which its state media swiftly described as "a ideal success". "No way... A use of military force, but that would result in a second Korean war".
"The proliferation of nuclear, chemical and biological weapons, as well as their means of delivery, constitutes a threat to worldwide peace and security", the council said in a statement. The country is also developing solid-fuel missiles that could be fired from land mobile launchers or submarines. Those three prongs - ground, air, and submarine - constitute what the military calls its nuclear triad.
"I can not solve the deterrent problem reducing it from a triad".
"This is in order to make the right conditions for dialogues and I would like to emphasize this", he said. Trump said on Twitter in response to the North's nuclear test.
A pre-emptive strike against Pyongyang's leadership would be hard to undertake, but it's widely seen as the most realistic of the limited military options Seoul has to deny a nuclear attack from its rival.
A Taurus "bunker buster" cruise missile released from a South Korean F-15 fighter "ies to its target Wednesday in what officials said was a successful".