"We hope they fulfill their duties and make it unnecessary for the Islamic Republic of Iran to reconsider its relations with them," Ahmadinejad said.

Although Iran says it bases nuclear policy on the NPT, it pulled out of the treaty's Additional Protocol -- which allows snap inspections of atomic facilities -- in February after the IAEA referred its nuclear file to the Security Council.

Iran often says it does not benefit from the NPT's entitlement to shared technology, but Western diplomats say it must prove its goals are peaceful to qualify for this.

The IAEA has said that after three years of investigation it still cannot confirm that Iran's aims are entirely peaceful, although it has found no hard proof of a military program.

The agency points to gaps in its information, such as the status of Iran's research into P-2 centrifuges that can enrich uranium faster than the P-1 units it now operates.