Six major world powers have agreed to begin putting together proposed new sanctions on Iran over its suspect nuclear programme after China dropped its opposition, US officials said today.
China, which has long opposed fresh international penalties against Iran, had signalled its willingness to consider a United Nations Security Council sanctions resolution, the officials said.
Speaking at the UN headquarters in New York, US Secretary of State Hillary Clinton said the officials had "accurately described" the position of the five permanent members of the security council and Germany.
She did not elaborate but said the group, known as the "P5-plus-one", was unified.
"There will be a great deal of further consultation, not only among the P5-plus-one but other members of the security council and other member nations during the next weeks," she said.
China's change of position improves prospects for passing a resolution aimed at pressuring Iran to scale back its nuclear ambitions, which Tehran insists are limited to developing nuclear power for peaceful purposes.
US President Barack Obama said on Tuesday that he hoped to have Iran sanctions in place within weeks - a timetable that appeared highly ambitious given China's previous reluctance to even discuss specific sanctions. China had insisted that negotiation with Iran needed to be pursued.
But today the two US officials said that in a phone call among officials from the US, Russia, China, Britain, France and Germany, the Chinese representative said his country was prepared to discuss specific potential sanctions.
One of the officials said China had made a "commitment" to discuss the specifics of a security council resolution and that on that basis the US would press ahead with an effort to pass such a measure.
The officials warned however that this did not mean there was yet a full consensus on UN sanctions.
The Obama administration is hoping to get a UN resolution by the end of April. Mrs Clinton has not publicly cited a specific timetable but in recent days has sounded more optimistic about the chances of getting China to agree that new penalties are needed to force Iran's hand.
"We happen to think that action in the security council is part of negotiation and diplomacy that can perhaps get the attention of the Iranian leadership," she said.
French president Nicolas Sarkozy, speaking to reporters after meeting Mr Obama at the White House on Tuesday, said Washington and Paris were "inseparable" on the subject of Iran sanctions.
"Iran cannot continue its mad race towards acquiring nuclear weapons," Mr Sarkozy said. "The time has come to take decisions."