Iran is a problem that is ever more "relevant", the U.N. nuclear watchdog's chief, Rafael Grossi, said on Friday, in an apparent reference to the growing number of advanced centrifuges the Islamic Republic is using to enrich uranium.
The International Atomic Energy Agency has said in recent confidential reports to member states seen by Reuters that Iran has been installing and enriching with more cascades, or clusters, of advanced centrifuges at its underground enrichment plants at Natanz and Fordow.
