The U.N. nuclear agency says Iran has made important progress in revealing details about its nuclear program, but continues to defy U.N. Security Council demands to stop enriching uranium.
The International Atomic Energy Agency announced that finding in a report released Thursday.
Iran says the report shows it has been cooperating with the IAEA. Iran's top nuclear negotiator, Saeed Jalili, says the Security Council would be wrong to pursue another round of sanctions against Tehran.
But the United States says the report shows Tehran continues to ignore international demands to suspend sensitive atomic work.
Washington has called for a third round of U.N. sanctions against Iran for its refusal to suspend uranium enrichment, a process that can be used to make nuclear weapons.
China and Russia, both permanent U.N. Security Council members, have been reluctant to support more sanctions.
The United States and its allies accuse Iran of seeking nuclear weapons - a charge Iran denies.
Some information for this report was provided by AFP, AP and Reuters.