FILE - In this June 6, 2018, file frame from Islamic Republic Iran Broadcasting, IRIB, state-run TV, three versions of domestically-built centrifuges are shown in a live TV program from Natanz, an Iranian uranium enrichment plant, in Iran. A report Friday, May 31, 2019, by U.N. nuclear watchdogs said Iran had begun installing IR-6s like the one shown on the left. That raised questions for the first time about its adherence to a key provision of Iran’s 2015 nuclear deal with world powers that was intended to limit the country’s use of advanced centrifuges. (IRIB via AP, File)
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