The IAEA told member states that it had verified Iran’s using “257g of uranium enriched up to 20 per cent U-235 in the form of UF4 (uranium tetrafluoride) to produce 200g of uranium metal enriched up to 20 per cent U-235”. The U.S. diplomatic spokesperson characterised Iran’s actions as “unconstructive and inconsistent with a return to mutual [JCPOA] compliance… Iran has no credible need to produce uranium metal, which has direct relevance to nuclear weapons development”. He further warned: “We are not imposing a deadline for negotiations, but this window will not remain open indefinitely”.