The Director General of the International Atomic Energy Agency, Rafael Grossi, has completed an unannounced inspection of two undeclared nuclear sites in Iran, marking a significant step forward in the multilateral effort to contain Tehran’s atomic ambitions. The inspection, conducted late on Wednesday, was part of a confidential agreement brokered by British diplomats that has been hailed as a model for future non-proliferation diplomacy.
The IAEA team, accompanied by Iranian officials, visited a former military compound near the city of Isfahan and a second location in the central province of Yazd. Intelligence reports had suggested these sites were used for undeclared uranium enrichment and metallurgical experiments dating back to the early 2000s. The inspectors collected environmental samples and reviewed documents provided by Iran, the results of which will be analysed in Vienna over the coming weeks.
In a statement released this morning, Grossi described the inspections as “thorough and cooperative” and commended Iran’s compliance with the terms of the agreement. Tehran has denied any past wrongdoing, insisting that its nuclear programme remains peaceful. However, the IAEA has long suspected that Iran conducted weapons-related work up until 2003, with some activities possibly continuing without declaration.
The deal that made the inspections possible was finalised after a series of secret talks in Geneva involving the UK, France, Germany, and Iran. Unlike the 2015 Joint Comprehensive Plan of Action which collapsed after the US withdrawal, this initiative relies on a phased, incremental approach. Iran has agreed to a set of transparency measures in exchange for limited sanctions relief on medical and agricultural imports. The UK Foreign Office confirmed that the agreement is structured to expand step by step, with each verified compliance milestone unlocking further concessions.
Analysts view this as a carefully calibrated attempt to prevent escalation. Israel and the United States have both signalled their scepticism, with Washington insisting that any deal must address Iran’s ballistic missile programme and regional proxy forces. Yet the UK-led approach has won cautious support from Russia and China, both of which have called for a return to diplomacy.
The inspections come at a time of heightened tension in the Middle East. Iran has enriched uranium to 60 per cent purity, just short of weapons-grade levels, and its stockpile is estimated to be enough for several nuclear devices. The IAEA’s verification mission is therefore seen as a crucial confidence-building measure. If the samples confirm Iran’s declarations, it could pave the way for a broader dialogue on the future of its nuclear programme.
Critics warn that the current agreement is too narrow. David Albright, a former UN weapons inspector, said that it “appears to be a small step forward, but Iran’s past record of undeclared activities demands far more intrusive access.” Others counter that any verification is better than none, and that the IAEA’s return to Iran after months of stalemate is itself a victory for institutional diplomacy.
The IAEA board will meet next month to review the findings. Meanwhile, British diplomats are already planning the next phase of talks, which could include discussions on centrifuge research and heavy water production. For now, the successful inspections serve as a reminder of the role that discreet, statecraft-driven negotiation can still play in managing the world’s most dangerous proliferation challenges.
