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FILE - Head of Iran's atomic energy department Mohammad Eslami waves to media at the conclusion of his joint press conference with International Atomic Energy Organization, IAEA, Director General Rafael Mariano Grossi, left, after their meeting in the central city of Isfahan, Iran, on May 7, 2024. While Iran's nuclear program stands at the precipice of tipping over into enriching uranium at weapons-grade levels, Tehran has held quiet, indirect talks with the United States and invited the head of the United Nations' atomic watchdog into the country for negotiations. (AP Photo/Vahid Salemi)
This is a locator map for Iran with its capital, Tehran. (AP Photo)
International Atomic Energy Agency (IAEA) Director General, Rafael Grossi, addresses the media after arriving at the Vienna International Airport in Schwechat, Austria, Tuesday, May 7, 2024. The head of the United Nations' atomic watchdog traveled Monday to Iran, where his agency faces increasing difficulty in monitoring the Islamic Republic's rapidly advancing nuclear program as tensions remain high in the wider Middle East over the Israel-Hamas war. (AP Photo/Heinz-Peter Bader)