The United States and its partners in the P5+1 group of countries recently approved the transfer from Russia to Iran of 116 metric tons of natural uranium. The transfer, which would be the first since the nuclear agreement came into force, must first be formally approved by the U.N. Security Council. The uranium transfer would serve as compensation for Iran's shipment to Russia of 40 metric tons of heavy water. Iran has not stated how the uranium will be used.