The US Attack on Iran May Have Damaged Disarmament Efforts More Than Iran’s Nuclear Capabilities
Union of Concerned Scientists
JUNE 26, 2025
U-235 is the isotope that can be used to sustain a chain reaction leading to the production of nuclear power (at low enrichment levels) or to build a deliverable nuclear weapon (at higher enrichment). US intelligence assessments repeatedly confirmed that Iran abandoned its weapon program in 2003 and had not changed its mind.
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