Iran is seeking to purchase 950 tonnes of uranium ore from Kazakhstan for the purpose of producing nuclear fuel with Russian assistance. According to the head of the Atomic Energy Organization of Iran (AEOI), 650 tonnes would be delivered to Iran in two shipments over two years, with the final 300 tonnes delivered in the third year and returned to Kazakhstan after enrichment. The nuclear agreement does not set limits on Iran's stockpile of uranium ore but the sale must be approved by all parties to the agreement.  Britain has withheld its approval.