Iran's Atomic Energy Organization and its head Ali Akbar Salehi face sanctions, but foreign companies working on Tehran's civilian nuclear program are still exempt

Assistant head of country's Atomic Energy Organization says '50 new achievements' will be revealed next year

Ali Akbar Salehi says production of low-enriched uranium increasing after operations at Fordo underground site resumed; Rouhani: Nuke deal could open up international arms sales

Enrichment up from 3.67% limit established in 2015 deal; Tehran doubles down on claim that security check last week exposed a UN inspector's tie to possible sabotage of the program

Sources say allowing Russian, Chinese and European companies to work at Arak and Fordow facilities will aid non-proliferation efforts

Head of Iranian atomic agency accuses EU of having 'failed to act on their promises' after US pullout from nuclear deal

Tehran has threatened to further step back from 2015 nuclear deal if negotiations with Europe yield no results

Invitation reportedly extended with US president's blessing; Iranian diplomat said to have expressed concerns any meeting would be little more than a photo op, New Yorker says

Mohammad Javad Zarif offers no further clarification on what Iranian actions may include, but says they are in response to the pact not being implemented by 'others'

Tehran's atomic agency chief briefs lawmakers on unraveling nuclear deal, as remaining signatories after US pullout set to meet in Vienna