"What is important for Iran is to enrich (uranium) on its soil," Larijani was quoted as saying by local news agencies, but added that if there was a formal proposal for enrichment abroad "we will discuss it."

Under a proposal reportedly being floated, Iran would be allowed to carry out an initial step in making nuclear fuel -- converting uranium ore into the uranium hexafluoride gas that is the feedstock for making enriched uranium.

But enrichment itself could be carried out in Russia under an offer reportedly being considered by the European Union and the United States.

Russia has staunchly backed Iran's right to a civilian nuclear energy programme, but the United States has alleged the Tehran's effort is a cover to develop weapons.