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Iran’s Near-Weapons-Grade Uranium Stockpile Surges to 408.6 kg, IAEA Finds

IAEA’s latest report also uncovers secret nuclear activities at three undeclared sites, adding momentum to possible snap-back sanctions and threatening to derail US-led deal efforts.

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Iran has reportedly been stockpiling undeclared nuclear materials to carry out secret activities.
A view of the International Atomic Energy Agency (IAEA) laboratories in Seibersdorf, Austria, May 26, 2025. REUTERS/Leonhard Foeger
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Overview

  • As of May 17, Iran held 408.6 kilograms of uranium enriched to 60% purity, marking a nearly 50% increase since the IAEA’s February assessment.
  • The agency concluded that Tehran carried out undisclosed nuclear operations with undeclared materials at three locations until the early 2000s.
  • IAEA Director General Rafael Mariano Grossi reiterated an urgent call for Iran to cooperate fully with the watchdog’s investigation into uranium traces at undeclared sites.
  • Iranian officials have dismissed prospects of an imminent agreement, insisting any deal must lift all sanctions and permit ongoing nuclear activities.
  • Western powers and Israel are eyeing the reinstatement of snap-back sanctions under the 2015 deal if Tehran fails to clarify its nuclear programme.