Why it matters: This will be Iran's most severe violation of the 2015 nuclear deal since the Trump administration withdrew from the agreement in 2018. It's also a serious blow to the ongoing efforts to salvage the deal. The announcement comes in response to the explosion at the Natanz uranium enrichment facility, for which Iran blames Israel. It will leave Iran short of the 90% enrichment necessary to produce a nuclear weapon, but bring Iran closer to that threshold than ever before. Araghchi added that another 1,000 centrifuges with 50% more enrichment capacity will be added in Natanz, in addition to replacing the damaged centrifuges.