Chernobyl strike exposes nuclear law gap

At 02:10 on June 7, a Russian Shahed drone hit the reception building at Ukraine's Centralized Spent Fuel Storage Facility, the depot inside the Chernobyl exclusion zone where used reactor fuel is kept. No radiation was released. A small fire was put out within an hour. Rafael Grossi, director general of the International Atomic Energy Agency, called the strike "deeply concerning", noting that nuclear material was stored "just metres away from the attacked building" (Infobae). Poland scrambled fighter jets, treating the incident as a live threat. The awkward part is legal as much as military: the facility that was hit has no specific protection under the wartime rules as they are written.

What the drone missed

The drone struck a logistics intake hall, the point where fuel containers arrive before being moved into storage vaults. Energoatom, Ukraine's nuclear operator, said no spent fuel was inside the building at the time. Polish radiation monitors recorded no change in background levels. No workers were injured.

The unresolved question is how close the blast came to stored nuclear material. Grossi said "metres", but no independent measurement has been published. The IAEA sent an inspection team to the site. As of June 8, its findings had not been made public. The difference between a detonation five metres from sealed spent-fuel casks and one 100 metres away is not technical hair-splitting. It changes the risk entirely, and only the inspectors can settle it.

A legal gap, dormant since 1977

International humanitarian law has a specific wartime rule for nuclear facilities: Article 56 of Additional Protocol I to the Geneva Conventions, the 1977 treaty governing conduct in armed conflict. It protects "nuclear electrical generating stations" from attack. A spent fuel storage facility does not generate electricity. On the plain text of the treaty, it sits outside Article 56.

The other relevant agreement, the Convention on the Physical Protection of Nuclear Material, explicitly exempts situations of armed conflict.

That leaves much of the nuclear fuel cycle outside operating reactors without a binding wartime shield. Enrichment plants, research reactors and spent fuel stores are not covered by a specific prohibition. The gap reaches well beyond Ukraine. EU member states operate their own spent fuel facilities, reprocessing plants and research reactors. If non-reactor nuclear sites can be struck without breaching a specific legal rule, the precedent will matter in any future conflict.

Article 56(6) tells states to "conclude further agreements to provide additional protection" for installations containing nuclear material. That instruction has been sitting there since the treaty entered into force. No state, EU institution or international body has acted on it.

The pressure is no longer theoretical. A drone crashed in the Chernobyl exclusion zone on May 8, starting a large forest fire. Now a drone has detonated inside the perimeter of a spent fuel complex. Each incident has moved closer to nuclear material.

What the IAEA can do, and what it can't

The strike landed a day before the IAEA Board of Governors, the agency's 35-member decision-making body, met in Vienna. Ukraine asked for the incident to be put on the agenda.

The Board's leverage is narrow. The IAEA cannot impose sanctions. It can document, condemn and refer matters to the UN Security Council, where Russia has a veto. Grossi's "seven indispensable pillars of nuclear safety", the framework he introduced in 2022 for protecting nuclear sites in conflict, sets out principles but has no legal force.

Poland's response exposed another weakness in Europe's systems. Its armed forces treated the strike as a potential military threat and launched fighters. But the EU's cross-border nuclear alert systems, built after the 1986 Chernobyl disaster, are triggered by spikes in radiation readings. The readings stayed normal. The system worked as designed. It was never designed for a weapon detonating inside a nuclear materials complex without causing a radiological release.

The IAEA inspection report may force that issue into the open. Europe's nuclear emergency infrastructure assumes that danger and radiation arrive together. A drone landing metres from spent fuel, with no release, falls into a category the system does not recognise.

The outcome of the Board of Governors meeting is not yet public. No EU member state has signalled willingness to invoke Article 56(6). The treaty clause calling for broader protection of nuclear sites has existed since 1977. No government has used it.