Rafael Grossi, the director-general of the International Atomic Energy Agency (IAEA), has visited Iran’s key underground uranium enrichment sites at Fordow and Natanz, Iranian state media reported on November 15, without offering details. Iran has restricted inspection of its nuclear sites and barred several IAEA inspectors from visiting its enrichment facilities. Grossi is in Iran to push for diplomacy, warning that the “space for negotiation…is getting smaller” over Iran’s advancing nuclear program. Tehran insists its nuclear ambitions are peaceful. The visit comes ahead of an upcoming meeting of the IAEA's Board of Governors, where some nations are pushing for action against the Islamic republic.