If carried out, that option could mean a halt to U.S. trade with China, which has supported economic sanctions on North Korea but remains the key economic partner for the rogue nation.
"China will work with the worldwide community to comprehensively and completely implement the relevant resolutions of U.N Security Council, firmly push forward the denuclearization of the peninsula, and maintain the peace and stability of the peninsula". But Japan's Chief Cabinet Secretary Yoshihide Suga said Tokyo could not rule out the possibility that it was a hydrogen bomb.
Donald Trump branded North Korea "a rogue nation" whose "words and actions continue to be very hostile and dangerous" to the United States.
Following the test, Trump posted a series of tweets suggesting that the USA could use military force against North Korea.
President Donald Trump warned Sunday that the United States was considering cutting economic ties with any countries that do business with North Korea.More news: United States could withdraw from South Korea trade deal
"We strongly urge the DPRK to face up to the firm will of the global community on the denuclearization of the peninsula, to earnestly abide by the relevant resolutions of the UN Security Council, to stop making the wrong actions which will worsen the situation and against of the DPRK's own interests, and to effectively return to the track of dialogue to solve the problem. We will provide updates as necessary", said White House Press Secretary Sarah Huckabee Sanders.
A spokesperson for Vice President Mike Pence said he would be in attendance. The meeting will be presided by President Moon Jae-in, CNN reported.
The International Atomic Energy Agency, which has no access to North Korea, called the nuclear test, Pyongyang's sixth since 2006, "an extremely regrettable act" that was "in complete disregard of the repeated demands of the international community".
The precise strength of the explosion, described by state-controlled media in North Korea as a hydrogen bomb, has yet to be determined.
"That scale is to the level where anyone can say [it is] a hydrogen bomb test", said Kune Y Suh, a nuclear engineering professor at Seoul National University.
The timing speaks of leader Kim Jong Un's willingness to provoke China; and an attempt to seize the moment to wedge South Korea and US President Donald Trump.
On July 28, North Korea conducted a test launch of an intercontinental ballistic missile that landed off the coast of Japan.More news: LG V30 is waterproof with an IP68 rating
China has said it wants denuclearisation but has grown increasingly irate at the U.S. in the past fortnight, after Washington imposed unilateral sanctions on Chinese companies caught dealing with North Korea.
He pointed to the fact that Pakistan - whose nuclear programme is believed to have links with the North's - conducted six nuclear tests in total, and may not have seen a need for any further blasts. North Korea's previous largest was thought to be anywhere from 10 to 30 kilotons.
China's ministry of foreign affairs was quick to condemn the test.
"It becomes cliche to say there are no good options here, but there really aren't", Flake said.
Under third-generation leader Kim, North Korea has been pursuing a nuclear device small and light enough to fit on a long-range ballistic missile, without affecting its range and making it capable of surviving re-entry.
The photos released earlier showed Kim talking with his lieutenants as he observed a silver, peanut-shaped device that the state-run media said was created to be mounted on the North's "Hwasong-14" ICBM. Trump has long pressured China to do more to rein in North Korea, but Beijing has rejected responsibility for bringing Kim Jong Un's regime under control. "And he needs to let his diplomats and his military generals and others handle this situation".More news: Apple's iPhone 8 event is confirmed for September 12