Tehran said Sunday that it has begun transporting enriched uranium to Russia, in line with a deal reached with the West earlier in the year to reign in Iran's nuclear programme.
Nine tons of enriched uranium have already been sent to Russia, Iranian Atomic Energy Organization head Ali Akbar Salehi was quoted by media as saying.
Iran agreed to sell large parts of its stock of enriched uranium as one of the key requirements in the mid-July agreement with the five United Nations veto powers - China, France, Russia, Britain and the United States - plus Germany.
Tehran has also begun dismantling thousands of centrifuges in line with the deal.
Salehi hopes that Tehran's obligations will be met by the end of the year, allowing the agreement to be formally implemented. On this so-called implementation day, the European Union and the United States will lift their sanctions targeting Iran.
Ahead of that day, the International Atomic Energy Agency (IAEA) in Vienna must verify whether Tehran has satisfied all the conditions set by the agreement. A decision is expected before the end of the year.