25 September, 2017
While its is not certain how such events might unfold, or even if North Korea will conduct such a trial, it is possible that Pyongyang would opt for an end-to-end test of a ballistic missile tipped with a nuclear warhead.
The exercises were meant to underscore "the seriousness with which we take DPRK's reckless behavior", White said, using an acronym for North Korea.
Xinhau, China's official news agency, said the country's seismic service registered a 3.4 magnitude event that it originally viewed as "likely caused" by an "explosion".
Washington announced tougher restrictions Friday aimed at curbing North Korea's nuclear and ballistic missile programme, building on tough new United Nations sanctions aimed at choking Pyongyang of cash.
The tougher stance follows North Korea's latest nuclear test this month.
A secondary tremor detected after that test could have been caused by the collapse of a tunnel at the mountainous site, experts said at the time.
The United States Geological Survey (USGS) said the quake struck around 20km away from the North's nuclear test site, where earlier this month Pyongyang detonated its sixth and largest device, which it claimed to be a hydrogen bomb capable of being launched onto a missile.
Trump's latest steps to punish foreign companies that deal with the North was the latest salvo in a USA -led campaign to isolate and impoverish the government of Kim Jong Un until it halts the missile and nuclear tests.
Uber denied new London operating licence
The transport body also queried Uber's use of Greyball software, which could be used to block regulators' access to the app. The company was open to sitting down with regulators to find out what it could do to save its operations.
Kim Jong Un, in an unusual direct statement to the world, pledged hours earlier to take "highest-level" action against the USA over President Trump's threat to "totally destroy" the North if provoked.
Would exploding a hydrogen bomb over the Pacific, as North Korea has threatened, push the current war of words between the US and North Korea closer to actual war?
As we all continue to pay attention to Kim's nuclear missile posturing, it's important we not lose sight of North Korea's cyberattack initiatives, which have successfully disrupted the West in recent years and will continue to do so in the future if we don't take action. Because Chinese is the main trading partner with North Korea anyway.
Hours before, Trump had announced issuance of a new Executive Order that expands sanctions of United States of America against maritime transport, banking, ports and manufacturing of North Korea.
North Korea is also believed to be responsible for the cyber heist at Bangladesh's central bank and the global WannaCry ransomware attack from earlier this year.
Russian Foreign Minister Sergey Lavrov has urged calm and likened the argument to a kindergarten scrap, with North Korea's foreign minister, Ri Yong Ho, expected to speak at the United Nations General Assembly later on Saturday.
China's Big Four state-owned banks have stopped providing financial services to new North Korean clients, Reuters reported last week, with some measures beginning as early as the end of previous year.