The US says it is nearer to a diplomatic breakthrough on Iran’s nuclear ambitions, claiming China has dropped its opposition to sanctions.
Iran is China’s third-largest oil supplier, while Beijing has invested heavily there.
But now Washington says the US and China will together draft resolution for sanctions at the United Nations.
The Iranian Foreign Ministry reacted defiantly to the news, slamming proposed sanctions as “unjust, illogical and unfair”.
“Whoever steps in this direction will deprive itself of the interests it can enjoy by having ties with the Islamic Republic of Iran,” Ramin Mehmanparast told journalists in a barely veiled threat to Beijing.
He added the threat of sanctions would not stop the country from enriching uranium.
The US and its allies say Tehran wants to build a nuclear arsenal. Iran claims its program is for generating energy.
In February, Iran confirmed it had started producing 20 per cent enriched uranium. 90 percent is the level used in nuclear weapons.
Iran, which was not invited to the Washington summit, said it will organise its own meeting on Saturday and Sunday with 15 other countries.
The delegates set to attend have not been confirmed.