"This past weekend, Trump again declared war on us, saying that our regime will not last long", Ri said, saying that the worldwide community had hoped for the war of words between Washington and Pyongyang to escalate into actions. China is North Korea's most important trading partner.
The release comes after data on Saturday showed China's trade with North Korea jumped in August even after the United Nations sanctions, mainly driven by a rise in imports.
"The White House on Monday rejected the notion that the US had declared war and ripped Pyongyang's talk of shooting down American planes".
The US Treasury accused the Foreign Trade Bank of carrying out transactions on behalf of the North Korean military's weapons development program.
Defence Secretary James Mattis said today the USA wants a diplomatic resolution to his country's standoff with North Korea, in an apparent effort to cool frayed tempers amid an escalating war of words between Pyongyang and Washington. Trump said on Twitter late on Saturday.
The president also said he would "totally destroy" North Korea if the USA had to defend itself or its allies.
President Donald Trump addresses the 72nd Annual UN General Assembly in New York on Sept. 19 2017
Two days ago United States warplanes flew close to North Korea's coast in a show of force.
'The question of who will be around much longer will be answered then, ' he added.
Asked how concerned China was the war of words between Trump and North Korea could get out of control, foreign ministry spokesman Lu Kang described the situation as highly complex and sensitive.
The U.S. flew bombers as far north as they've gone above the demilitarized zone this century over the weekend as a show of force.
The Trump administration on Tuesday announced new sanctions against North Korean banks.
He said they must act now to achieve the denuclearisation of North Korea. He's saying things that should "never, ever" be said, alleged the US President. "We want to reiterate that the only solution for this is a political solution and I would also reiterate the secretary general's call for statesmanship", Stephane Dujarric told reporters.