The US has urged the world to cut diplomatic and trade ties with North Korea following its latest ballistic missile test.
Speaking at the UN Security Council, US envoy Nikki Haley said President Donald Trump had asked his Chinese counterpart to cut off oil supplies to Pyongyang.
Nikki Haley said the US did not seek conflict but that North Korea’s regime would be “utterly destroyed” if war broke out.
The warning came after North Korea tested its first missile in two months.
North Korea said the missile fired on November 29, which it said reached an altitude of about 2,780 miles – more than 10 times the height of the International Space Station – carried a warhead capable of re-entering the Earth’s atmosphere.
The claim was not proven and experts have cast doubt on North Korea’s ability to master such technology.
However, North Korean leader Kim Jong-un called the launch “impeccable” and a “breakthrough”.
The test – one of several this year – has been condemned by the international community and the UN Security Council called an emergency meeting.
Nikki Haley warned that “continued acts of aggression” were only serving to further destabilize the region.
Russia’s Foreign Minister Sergei Lavrov said sanctions were exhausted.
He told reporters: “The Americans should explain to all of us what they are trying to do – if they want to find a pretext for destroying North Korea they should come clean about it, and the American leadership should confirm it.”
Earlier the Russian UN ambassador said North Korea should stop its missile and nuclear tests but also called on Washington to cancel military exercises with South Korea planned for December as it would “inflame an already explosive situation”.
China also suggested North Korea should stop the tests in return for a halt to US military exercises – a proposal Washington has rejected in the past.
Nikki Haley said on November 29: “We need China to do more.
“President Trump called President Xi this morning and told him that we’ve come to the point where China must cut off the oil for North Korea.
“We know the main driver of its nuclear production is oil,” she said. “The major supplier of that oil is China.”
China is a historic ally and North Korea’s most important trading partner and Pyongyang is thought to be dependent on China for much of its oil supplies.
Also in the day, the White House said that President Trump spoke to his counterpart, Xi Jinping, by phone, urging him to “use all available levers to convince North Korea to end its provocations and return to the path of denuclearization”.
Donald Trump tweeted: “Just spoke to President XI JINPING of China concerning the provocative actions of North Korea. Additional major sanctions will be imposed on North Korea today. This situation will be handled!”
Speaking in Missouri, President Trump derided Kim Jong-un, describing him as a “sick puppy” and “little rocket man”.
Xi Jinping responded by telling Donald Trump it was Beijing’s “unswerving goal to maintain peace and stability in north-east Asia and denuclearize the Korean peninsula”, Chinese news agency Xinhua reported.
Experts say the height reached by the inter-continental ballistic missile (ICBM) indicates the US could be within range, although North Korea is yet to prove it has reached its aim of miniaturizing a nuclear warhead.