UN atomic official in Iran as it runs advanced centrifuges

Iran defended Sunday its decision to use advanced centrifuges prohibited by its unraveling 2015 nuclear deal with world powers as a visiting top official of the United Nations atomic watchdog urged Tehran to offer "time and active cooperation" with his inspectors.The visit and careful comments by Cornel Feruta, the acting director-general of the International Atomic Energy Agency, show the pressure his organization is now under as Iran steps further away from the deal the IAEA is meant to monito