Darya Dolzikova​

Weapons-grade uranium, which is needed for a nuclear bomb, is 90% enriched or more. The IAEA head, Rafael Grossi, has suggested what Iran is doing may be a response to the country's regional setbacks. "It's a really concerning picture," says Darya Dolzikova, expert on nuclear proliferation at the Royal United Services Institute think tank. "The nuclear programme is in a completely different place to where it was in 2015."

On June 18 this year, the US Senate passed the ADVANCE Act, to accelerate the adoption of next-generation nuclear reactors in the US. Darya Dolzikova, a research fellow at the Royal United Services Institute, wrote in March that “US utilities may struggle to keep nuclear power plants operating should Russian enriched uranium supply be cut off”.

Darya Dolzikova of The Royal United Services Institute, a think tank, told Newsweek: "Iran has had plenty of opportunity to show that it's willing to engage in good faith. There are issues on the table with the IAEA that remain unresolved for Iran, or rather that Iran has not resolved. And there's plenty of opportunity for Iran to demonstrate that it's willing to engage in potential nuclear negotiations."