China will limit exports of refined petroleum products to North Korea starting October 1, its commerce ministry said, confirming Beijing's participation in new United Nations sanctions meant to rein in its rogue neighbour.
A ban on textile imports from the North will go into effect immediately, the statement said.
Trump announced new USA sanctions on Thursday that he said allows the targeting of companies and institutions that finance and facilitate trade with North Korea.
But Beijing fears pressuring Kim's regime into collapse, triggering a flood of refugees across its border and eliminating a strategic buffer separating China from the USA military in South Korea.
A limited amount of petroleum allowed under the United Nations resolution will still be exported to North Korea.
North Korean textile exports in 2016 totaled $750 million, according to South Korea's Korea Trade-Investment Promotion Agency.
The statement said: "Servicepersons of the Ministry of the People's Armed Forces met Friday to vow to turn out in the final battle against the U.S. under the leadership of respected Supreme Commander Kim Jong-un".
In an unprecedented move, Kim has ordered his "powerful" army to "wipe out" the U.S. with a "strike offensive", according to the secretive state's Korean Central News Agency (KCNA).
"We have more than enough to concern ourselves with in our everyday lives".
Experts said Chinese banks had been told not to let North Korean individuals or companies open new accounts.
Asia markets in red, dollar weakens with Fed hike in question
The dollar steadied after sliding against a basket of currencies overnight, with the dollar index standing at 91.844 at 8:11 a.m. Hong Kong slipped 0.8 percent and Shanghai was 0.4 percent off, while Singapore shed 0.3 percent and Seoul lost 0.5 percent.
North Korea said on Saturday that firing its rockets at the US mainland was "inevitable" after US President Donald Trump called Pyongyang's leader "rocket man", in a further escalation of rhetoric between the two leaders.
The comments are the North's first response to Trump's debut speech at the U.N. General Assembly on Tuesday, during which he vowed to "totally destroy North Korea" if provoked.
Repeating a regular North Korean view, Ri argued that the country is developing nuclear weapons and missiles in response to the threat from the U.S. He referred to his country's weapons as the "nuclear hammer of justice", calling the country's arsenal "a righteous self-defense measure". "If China really really were to crackdown, they could paralyze what's left of the North Korean economy".
The tougher stance follows North Korea's largest nuclear test earlier this month.
Some have made contingency plans to evacuate beyond the reach of North Korea's artillery. "It is only a forlorn hope to consider any chance that the DPRK (Democratic People's Republic of Korea) would be shaken an inch or change its stance due to the harsher sanctions by the hostile forces", he said.
"None other than Trump himself is on a suicide mission", Ri said in a full-throated rebuke to Trump's remarks.
A day after Trump's address, North Korea's Foreign Minister Ri Yong Ho had likened Trump to a "barking dog", saying his comments were no threat to the North.
China accounts for some 90 percent of the North's trade, making its cooperation critical to efforts to derail Pyongyang's nuclear and missile development.
Trump said Thursday he will ramp up economic pressure on North Korea by signing an executive order that cracks down on anyone who does business with the hermit nation.
"People say this is all part of its brinkmanship strategy to force the U.S. to come forward for negotiation".