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Iran’s Near Weapons-Grade Uranium Stockpile Jumps 50%, IAEA Reports

The IAEA cautioned that Iran’s refusal to fully clarify uranium traces at undeclared sites raises risks of renewed 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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Overview

  • As of May 17, Iran held 408.6 kg of uranium enriched to 60 percent, an increase of 133.8 kg since February that narrows the gap to weapons-grade material.
  • The UN watchdog warned Iran is the only non-nuclear-weapon state enriching to this level and labeled Tehran’s cooperation on undeclared nuclear sites as “less than satisfactory.”
  • About 42 kg of 60 percent enriched uranium is theoretically enough for one bomb if taken to 90 percent purity, highlighting proliferation concerns.
  • US-Iran nuclear talks continue, with Washington demanding an end to enrichment for sanctions relief and Tehran insisting any deal must lift all sanctions and preserve its nuclear programme.
  • Israeli Prime Minister Benjamin Netanyahu denounced the findings as proof of Iran’s weapons intent, and European nations are weighing snapback sanctions if diplomacy stalls.