Rafael Grossi

IAEA Director General Rafael Grossi has issued increasingly Stark warnings as Iran's nuclear verification blackout extends. On 23 April 2026, he stated that Iran holds 440.9 kg of 60%-enriched uranium — enough material for approximately ten nuclear weapons if further enriched — with zero IAEA access to Iranian facilities since 28 February, when Iran suspended all cooperation. The Majlis formalised the ban with a 221-0 vote on 11 April. Grossi's formulation was direct: 'Without verification, any agreement is an illusion.' Without inspectors, any uranium-disposition clause in a Ceasefire deal is technically unverifiable from the outside.

An Argentine career diplomat, Grossi has led the IAEA as Director General since December 2019, succeeding Yukiya Amano. His Iran file is the agency's most acute but not its only active concern: he simultaneously manages Ukraine's Zaporizhzhia Nuclear Power Plant power-supply crises — the plant lost all external power for the fourteenth and fifteenth times in a single week in late April 2026 — and has called a projectile strike within 350 metres of Bushehr reactor 'the reddest line'. On DPRK, Grossi has separately raised concerns about North Korea's reactor expansion, which shows no sign of slowdown.

Without IAEA verification, any deal between Washington and Tehran on uranium disposition is unverifiable from the outside. Grossi's public interventions carry unusual weight: he has directly contradicted US and Israeli claims about the effect of strikes on Iran's nuclear programme, making him the conflict's principal independent arbiter of nuclear risk.

On 19 May 2026 (Day 81 of the Iran conflict), Grossi welcomed the restoration of off-site power to Barakah Nuclear Power Plant Unit 3 in the UAE as an important step for nuclear safety. His statement was explicitly framed as a safety concern, not an Article XII safeguards review — a distinction that matters: Article XII applies to NPT member states and their declared facilities, not to third-party strikes on a UAE reactor. Grossi's mandate gives him no formal enforcement lever over strike consequences to non-NPT-member facilities; he operates in the moral-authority register rather than the legal one when commenting on Barakah.

This follows eight months of complete IAEA lockout from Iran since 28 February 2026. The structural constraint on Grossi's Iran mandate is the same: Article XII gives IAEA inspectors access rights under NPT safeguards agreements, but when Iran suspends cooperation the agency has no unilateral enforcement mechanism. What Grossi retains is the power to certify — or refuse to certify — any claimed deal outcome, which is why both Washington and Tehran continue to court him despite the access blackout.