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Iran’s Near-Weapons-Grade Uranium Stockpile Rises 50% to 408.6 kg, IAEA Says

IAEA chief Grossi warns Tehran’s expanded near-weapons-grade uranium stockpile could prompt European nations to reinstate snap-back sanctions.

Rafael Mariano Grossi, the director-general of the International Atomic Energy Agency, speaks to journalists attending a weeklong seminar at the agency in Vienna, Austria, Wednesday, May 28, 2025. (AP Photo/Jon Gambrell)
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Iran has reportedly been stockpiling undeclared nuclear materials to carry out secret activities.

Overview

  • As of May 17, Iran held 408.6 kg of uranium enriched to 60%, marking a 133.8 kg increase since the IAEA’s February report.
  • The IAEA notes Iran is now the only non-nuclear-weapon state producing material at 60% purity and that roughly 42 kg of such uranium could yield one bomb if further enriched.
  • Inspectors detected traces of undeclared nuclear material at multiple Iranian sites and faulted Tehran for limited cooperation with investigations.
  • President Trump has expressed optimism about a potential nuclear deal, but Iranian officials insist any agreement must fully lift sanctions and allow enrichment to continue.
  • Director General Rafael Mariano Grossi cautioned that the report’s findings could lead European nations to reactivate snap-back sanctions or refer Iran to the UN Security Council.