Days after President Donald Trump threatened North Korea and belittled its leader in a speech at the United Nations, a official from the isolated communist nation blasted the president from the same stage and touted his country's nuclear weapons program.
Tests of nuclear-tipped ballistic missiles are rarer still. However, the underlying message it appears to be giving is one of disbelief that a US president is not backing down and is making such a forceful threat.
Some analysts saw a clear sign that North Korea will ramp up its already brisk pace of weapons testing, which has included missiles meant to target USA forces throughout Asia and on the US mainland. "Together with China we'll continue to strive for a reasonable approach and not an emotional one like when children in a kindergarten start fighting and no-one can stop them", he said.
It said the operation showed the seriousness with which it took North Korea's "reckless behavior". "We really have no choice", he said.
"Trump might not have been aware what is uttered from his mouth.but we will make sure that he bears consequences far beyond his words, far beyond the scope of what he can handle even if he's ready to do so", he continued.
Trump said the United States would "totally destroy" North Korea if it threatened the United States or its allies.
The quake was detected in Kilju county in North Hamgyong province, where North Korea's known Punggye-ri nuclear site is located, according to South Korea's meteorological agency.
"And if the test doesn't go according to plan, you could have population at risk, too", he said.
Monitoring groups estimate that the nuclear test conducted in North Korea earlier this month had a yield of 250 kilotons, which is 16 times the size of the United States bomb that destroyed Hiroshima in 1945.
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In a lengthy statement carried by state media, Kim said Trump would "pay dearly" for his recent threat to destroy North Korea.
The explosive statement comes as a large 3.4 magnitude quake struck North Korea, sparking fears Kim has tested another hydrogen bomb.
"But Kim Jong-Un and the Iranians have never seen anyone talk back to them in these terms". Experts say this is the first time a North Korean leader has made a direct address to an worldwide audience - and it merits serious and thorough consideration.
Beijing is also banning imports of textiles, one of Pyongyang's last major sources of foreign revenue.
The Korea Meteorological Administration also cited the possibility that the seismic activity Saturday occurred because of the geological stress from the nuclear test.
Such a test with a live warhead would tell North Korea's engineers whether their bomb design can survive the rigors of flight and re-entry into the Earth's atmosphere, says Michael Elleman, a missile defense expert at the International Institute for Strategic Studies.
"We have prepared for the final battle against the gangster-like U.S. imperialists for many years".
"We can not conclusively confirm at this time the nature (natural or human-made) of the event", the USGS said.