Increased uranium enrichment from a purity of 3.67% (and later, 4.67%) to at least 20% at the Fordow
plant. Iran was close to increasing uranium enrichment even further to 60%, just below the 90% threshold needed for bombs, and even planned to install faster cascades (IR-2 and IR-4) to expedite the process. However, an explosion at the Natanz centrifuge assembly facility in April 2021, believed to be the result of Israeli sabotage, destroyed over 1,000 centrifuges, preventing Iran from increasing uranium enrichment. In June 2021, the centrifuge production facility in Karaj was also destroyed in an unclaimed kinetic strike - likely an Israeli drone operation.
Stockpiled a record volume of highly enriched uranium. Iran went from 139 kilograms of enriched uranium in May 2018 (when Trump withdrew from the JCPOA), to over 3,000 kg in early 2021.
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