In this file photo dated Monday, Dec. 23, 2019, released by the Atomic Energy Organization of Iran, showing technicians at the Arak heavy water reactor's secondary circuit, as officials and media visit the site, near Arak, 150 miles (250 kilometers) southwest of the capital Tehran, Iran. Efforts to bring the United States back into the 2015 deal on Iran’s nuclear program are to step up a gear as Iran and the five world powers remaining in the accord meet in Vienna on Tuesday, April 6, 2021, while the U.S. is due to start indirect talks with Tehran. (Atomic Energy Organization of Iran via AP, File)
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