Iranian state radio says Tehran will reject a proposed U.N. resolution calling for Iran to suspend uranium enrichment.
A commentary broadcast Saturday said Iran would not accept unfair decisions, even in the framework of resolutions by international bodies.
On Friday, the five permanent members of the U.N. Security Council agreed to consider a resolution demanding that Iran cease uranium enrichment by August 31 or face the possibility of sanctions.
A vote is expected this week.
The proposal calls for the 15-member Council to consider adopting appropriate measures under Article 41 of the U.N. charter, which allows for economic sanctions but does not authorize the use of force.
It was negotiated after Tehran failed to respond to Western incentives in exchange for suspension of its uranium-enrichment activities. Tehran says it will not respond to the incentive package until August 22, nine days before the U.N. deadline.
The United States and its Western allies believe Iran is attempting to develop nuclear weapons. Tehran maintains its nuclear program is only for peaceful purposes.
Some information for this report provided by AP.