China's natural disaster administration said on Saturday it had detected a magnitude 3.4 quake in North Korea that was a "suspected explosion", raising fears the isolated state had conducted another nuclear bomb test weeks after its last one.
Ri said the United States has forced North Korea to possess nuclear weapons and that with Trump's speech "our rockets' visit to the entire US mainland" are all the more "inevitable".
Jong-un said that will consider his response being the "highest level of hard-line countermeasure".
The head of the nuclear test monitoring agency CTBTO said on Saturday that analysts were "looking at unusual seismic activity of a much smaller magnitude" in North Korea, and that it would have more details to come.
"The USGS said that their seismologists confirmed it happened at a depth of 5KM and said, We can not conclusively confirm at this time the nature [natural or human made] of the event".
The air patrolling started after a series of earthquakes in North Korea sparked fears that the country may have conducted another nuclear weapons test.
Shortly before his address, the Pentagon announced that the show of force underscored "the seriousness" with which the USA took North Korea's "reckless" behaviour, calling the country's weapons programme a "grave threat". Trump tweeted Friday that Kim was "obviously a madman" who would be "tested like never before".
North Korea has been maintaining a torrid pace in nuclear and weapons tests as it accelerates its pursuit of nuclear weapons that could viably target the United States and its allies in Asia.
North Korea's state-run Korean Central News Agency published articles Saturday with comments slamming Trump.
Chinese leaders were long the North's diplomatic protectors but express increasing frustration with the government of Kim Jong Un.
Nuclear tests have earlier caused earthquakes in the Communist-dominant country.
"This event occurred in the area of the previous North Korean Nuclear tests".More news: China says N.Korean quake 'suspected explosion', S.Korea says likely natural
A day earlier, Kim reacted to Trump's provocative speech at the U.N.by equating the USA president to "a frightened dog" and a "mentally deranged US dotard", employing an obscure insult for someone declining into senility. "I will surely and definitely tame the mentally deranged U.S. dotard with fire".
"Trump, the president of so-called "power, ' is mad enough to wag his tongue without any consideration that he would 'totally destroy" a sovereign state".
Trump has said he will not allow it, although the USA so far has not used military force to impede the North's progress.
On Thursday, US President Donald Trump ordered new sanctions that open the door wider to blacklisting people and entities doing business with the isolated nation, including its shipping and trade networks, further tightening the screws on Pyongyang's missile programme.
"It is a foolish misjudgment if Trump's gang thinks that America is safe because it's far away from the Korean Peninsula".
Participants of a mass rally shout slogans as they gather on Kim Il Sung sqaure in Pyongyang on September 23, 2017.
The Commerce Ministry in Beijing said that starting on October 1, China would limit supplies of refined petroleum products, local media reports.
A ban on textile imports from the North will go into effect immediately, the statement said.
"The new sanctions set a cap on crude and refined oil exports to North Korea at 8.5 million barrels per year, which represents a 30 percent reduction, according to US officials".
North Korea has been working on developing missiles that can reach the United States and its allies and pair them with a miniaturized nuclear warheads. Earlier this month the UN Security Council unanimously adopted its ninth round of sanctions on Pyongyang to counter its nuclear and ballistic missiles programs.