1979
Islamic Revolution — nuclear cooperation with US ended
2002
Natanz centrifuge plant revealed by MEK dissident group
2006
First uranium enrichment at Natanz — 3.5%
2010
Stuxnet worm destroys ~1,000 centrifuges (US/Israel)
2015
JCPOA signed — enrichment capped at 3.67%, monitors granted
2018
US withdraws from JCPOA; Iran begins exceeding limits
2021
Iran begins enriching to 20%, then 60% after Natanz attack
2023
IAEA: Iran has enough 60% material for several bombs if further enriched
2024
IAEA access severely curtailed; additional centrifuge cascades activated