Rafael Mariano Grossi
Rafael Mariano Grossi is the Director General of the International Atomic Energy Agency (IAEA), the UN's nuclear watchdog. He has become the central diplomatic figure managing nuclear safety risks at the Zaporizhzhia Nuclear Power Plant in Russian-occupied Ukraine, personally brokering a series of localized ceasefires between Russia and Ukraine to enable critical maintenance and repairs.
Rafael Mariano Grossi, an Argentine diplomat and nuclear expert, has served as Director General of the International Atomic Energy Agency since December 2019. The IAEA, headquartered in Vienna, is the principal international body responsible for promoting the peaceful use of nuclear energy and verifying that states comply with nuclear non-proliferation commitments.
Since Russia's full-scale invasion of Ukraine in February 2022, Grossi has taken on an unprecedented operational role: managing the nuclear safety crisis at the Zaporizhzhia Nuclear Power Plant (ZNPP), Europe's largest nuclear facility, which Russian forces seized early in the war. The plant's six reactors have been in shutdown mode, but they still require continuous cooling — a process dependent on reliable external power. Repeated damage to transmission infrastructure has repeatedly pushed the plant toward precarious single-line dependency.
Grossi's most distinctive contribution has been negotiating direct, localized ceasefires between Russia and Ukraine — not broad political agreements, but narrow, time-limited pauses in hostilities around the plant perimeter to allow IAEA-monitored maintenance and repair work. As of June 2026, he has brokered at least six such temporary ceasefires since late 2025. The most recent, which took effect on June 5, 2026, was arranged to allow repairs to a 750 kV power line that had been disconnected for over two months, leaving the ZNPP dependent on a single 330 kV line — a situation IAEA experts consider a serious safety risk.
This approach — using the IAEA's technical authority and Grossi's personal diplomacy to carve out narrow humanitarian and safety windows inside an active war — is without clear precedent in the agency's history. It has drawn both praise for pragmatism and criticism from those who argue it normalizes the occupation of a nuclear facility.
Grossi's work at Zaporizhzhia is directly relevant to Israel and the broader Jewish world in two respects: first, a nuclear accident in Ukraine would have continent-wide consequences, including for Jewish communities across Europe; second, Grossi's model of IAEA engagement with states in conflict informs how the agency approaches Iran's nuclear program, a matter of existential concern to Israel.