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A handout picture provided by the Iranian presidential office on April 10, 2021, shows Iranian President Hassan Rouhani delivering a speech on Iran's National Nuclear Technology Day, in the capital Tehran. - Iran announced today it has started up advanced uranium enrichment centrifuges in a breach of its undertakings under a troubled 2015 nuclear deal, days after talks on rescuing it got underway. President Hassan Rouhani officially inaugurated the cascades of 164 IR-6 centrifuges and 30 IR-5 devices at Iran's Natanz uranium enrichment plant in a ceremony broadcast by state television. (Photo by - / Iranian Presidency / AFP) / === RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / HO / IRANIAN PRESIDENCY" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS ===