John Kirby, the U.S. State Department spokesman, said on Monday that the Joint Comprehensive Plan of Action permits Iran to import natural uranium.

“The JCPOA does permit Iran to import natural uranium, and such transactions were always anticipated throughout the process of working towards the deal,” he said in a press conference.

According to RT, Moscow will deliver a large shipment of natural uranium to Tehran in compensation for exporting tons of Iranian heavy water for reactor cooling.

Diplomatic sources told AP that the move is approved by the major world powers, including the U.S.

The move must now be approved by the UN Security Council, which won’t be a problem as the permanent five are the only members of the Council with a veto, the sources added.

Kirby said, “Natural uranium is an internationally traded commodity. It’s not usable in its natural form for building a nuclear weapon. Iran can use any natural uranium it acquires only within the other limitations of JCPOA.”

Iran and the 5+1 group - the U.S., Britain, France, China and Russia plus Germany - finalized the text of the JCPOA in July 2015. It took effect in January 2016.