China defends its veto of UN Security Council resolution sanctioning North Korea

China warned of a potential "catastrophe" while forced on Wednesday to defend its veto last month of a United Nations Security Council resolution that would have punished North Korea for its latest intercontinental ballistic missile tests.

The rare UN debate came as officials in Washington, Seoul and the International Atomic Energy Agency warned that Pyongyang might be preparing an imminent nuclear test, which would be the country's seventh.

The UN General Assembly session on Wednesday concerning China and Russia's veto of new sanctions on North Korea. Photo: Reuters alt=The UN General Assembly session on Wednesday concerning China and Russia's veto of new sanctions on North Korea. Photo: Reuters>

"China always engages in the work of the Security Council in a responsible manner," Zhang Jun, China's ambassador to the UN, said in a speech that blamed the US for stoking tensions in Asia but did not mention any of North Korea's numerous recent weapons tests.

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"Under the current circumstances, all parties should remain calm," he said, adding: "It will be precisely irresponsible and derelict of duty for the Security Council to adopt a resolution without principle, which could result in serious consequences and plunge the countries and regions concerned into a catastrophe."

The public response from Beijing - as well as from Moscow - was the first of its kind at the UN, after a new rule was passed in April requiring an accounting in the General Assembly whenever a permanent member of the Security Council wields its veto.

The rule change came amid criticism at the UN after Russia used its veto power on the council to block a resolution condemning its own invasion of Ukraine. The General Assembly does not have the authority to override a Security Council veto, however.

The debate on Wednesday highlighted yet another dispute between Washington and Beijing - though over an issue that US officials insist remains an area where the US and China can cooperate.

"It's hard for me to imagine that Beijing would actually want North Korea to continue to provoke, violate multiple Security Council resolutions, and destabilise the region," Sung Kim, the US special envoy for North Korea, said on Tuesday.

"So we hope that China will be more forthcoming in working with us to deal with the situation on the peninsula."