South Korea’s president called the detonation, which Seoul estimated had produced the North’s biggest-ever explosive yield, an act of “fanatic recklessness.”
The North’s boast of a technologically game-changing nuclear test defies both tough international sanctions and long-standing diplomatic pressure to curb its nuclear ambitions. It will raise serious worries in many world capitals that Pyongyang has moved another step closer to its goal of a nuclear-armed missile that could one day strike the U.S. mainland.
Hours after Seoul noted unusual seismic activity near the North’s northeastern nuclear test site, Pyongyang said in its state-run media that a test had “finally examined and confirmed the structure and specific features of movement of (a) nuclear warhead that has been standardized to be able to be mounted on strategic ballistic rockets.”
“The standardization of the nuclear warhead will enable (North Korea) to produce at will and as many as it wants a variety of smaller, lighter and diversified nuclear warheads of higher strike power with a firm hold on the production of various fissile materials and technology for their use. This has definitely put on a higher level (the North’s) technology of mounting nuclear warheads on ballistic rockets,” the country said.
South Korean President Park Geun-hye strongly condemned the test, saying in a statement that it showed the “fanatic recklessness of the Kim Jong Un government as it clings to nuclear development.” Kim is the North Korean leader.
Park’s office said she spoke with U.S. President Barack Obama about the test Friday morning, during a regional summit in Laos. Park said South Korea will employ all available measures to put more pressure on North Korea, which has previously conducted nuclear tests every three to four years.
North Korea said there was no radioactive material leaked, but the explosion put the region on edge.
Chinese state media reported that the nation’s environmental protection agency started nuclear radiation monitoring. Japanese planes began to collect air samples from national air space to analyze possible radioactive materials. Tokyo Gov. Yuriko Koike said Japan’s capital city is also testing water samples and monitoring radiation levels in the air.
South Korea’s Joint Chiefs of Staff said in a statement that “artificial seismic waves” from a quake measuring 5.0 were detected near the Punggye-ri test site. European and U.S. monitoring services also detected similar seismic activity, with the U.S. Geological Survey calling it an “explosion” on its website.
A South Korean Defense Ministry official, who refused to be named because of office rules, said that Seoul detected an estimated explosive yield of 10 kilotons. After the North’s fourth test, in January, South Korean lawmaker Lee Cheol Woo said Seoul’s National Intelligence Service told him that an estimated explosive yield of six kilotons was detected.
The 5.0 magnitude earthquake Friday is the largest of the four past quakes associated with North Korean nuclear tests, according to South Korea’s weather agency. Artificial seismic waves measuring 3.9 were reported after North Korea’s first nuclear test in 2006; 4.8 was reported from its fourth test this January.
North Korean leader Kim Jong Un has overseen a robust increase in the number and kinds of missiles tested this year. Not only has the range of the weapons successfully tested jumped significantly, but the country is working to perfect new platforms for launching them — submarines and mobile launchers.
The longer ranges and mobile launchers give the North greater ability to threaten the tens of thousands of U.S. troops stationed throughout Asia.
The seismic activity comes on the 68th anniversary of the founding of North Korea’s government and just days after world leaders gathered in China for the G-20 economic summit.
Any test will lead to a strong push for new, tougher sanctions at the United Nations and further worsen already abysmal relations between Pyongyang and its neighbors. North Korea is already one of the most heavily sanctioned places on earth, and many question whether the penalties work.
China, the North’s economic lifeline and only major ally, has previously offered cover to Pyongyang, though Beijing has expressed growing frustration with what outsiders call provocations.
Pyongyang likely wanted to show the world that strong international sanctions following its fourth nuclear test and long-range rocket launch earlier this year haven’t discouraged its efforts to advance its nuclear weapons and missiles programs, according to Koh Yu-hwan, a North Korea expert at Seoul’s Dongguk University.
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