On Monday, President Trump re-listed North Korea as a state sponsor of terrorism, a list from which President George W. Bush removed from in 2008. Air China last cancelled flights to North Korea in April, citing low customer demand, but resumed them soon after.
The sanctions showed the determination of the U.S.to stifle trade across the Yalu or Amnok River between the Chinese city of Dandong and Sinuiju on the North Korean side.
North Korea joins Iran, Sudan, and Syria - the only countries designated by the U.S.as state sponsors of terrorism.
The Republican president, who has traded personal insults with North Korean leader Kim Jong Un but has not ruled out talks, said the Treasury Department will announce additional sanctions against North Korea on Tuesday.
North Korea condemned its USA terror listing as a "serious provocation" on Wednesday, warning that sanctions would never force it to abandon its nuclear weapons programme.
North Korea has not launched any missiles since September 15 and critics have argued that it was on a path of de-escalation, but the latest provocation along with the sanctions imposed by Trump administration aimed at crippling the country's economy could lead to more missile launches by North Korea.
"This designation will impose further sanctions and penalties on North Korea and related persons and supports our maximum pressure campaign to isolate the murderous regime".
North Korea responded on Wednesday to U.S. President Donald Trump's decision to relist the county as a state sponsor of terrorism, calling it a "grave provocation and aggressive violation", North Korean state media reported.
While China has backed the United Nations measures, it has been reluctant to take the more drastic step of cutting off oil supplies through a pipeline to North Korea's lone refinery, fearing that regime collapse could lead to chaos on their common border.
"The US will be held entirely accountable for all the consequences to be entailed by its impudent provocation to the DPRK", he said, using the initials of its official name, the Democratic People's Republic of Korea. The spokesperson noted that their actions included expulsion of North Korean workers and diplomats.
A spokesperson for North Korea's foreign ministry, said, US government's decision shows, how it is "just a tool for American style authoritarianism that can be attached or removed at any time in accordance with its interests", Sky News reported. Hill said North Korea had to be returned to the list in view of such acts of terror as the assassination of Kim Jong-Un's half-brother, Kim Jong-Nam, in Kuala Lumpur International Airport and the torture and death of university student Otto Warmbier.
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