Nuclear Site Attacks and Force Majeure: What GCs Must Do When Critical Infrastructure Becomes a War Target

Why Chernobyl Drone Strikes Are a Contract Law Problem, Not Just a Geopolitical One

The UNDP's warning that repeated drone attacks on the Chernobyl Nuclear Power Station are, in the words of administrator Alexander De Croo, "really gambling with the safety of millions of people" is a stark humanitarian alarm. For general counsel and law firms advising multinational clients, however, it is also a live stress-test of contract architecture. When a decommissioned but structurally sensitive nuclear site becomes a recurring military target, the legal consequences ripple outward through supply chains, insurance programmes, energy agreements and cross-border service contracts in ways that most standard drafting does not anticipate.

This piece sets out the regulatory and contractual framework that applies today, identifies which parties are bound by it, and explains the specific clause-level changes that prudent counsel should be making now.

The Existing Legal Framework: IAEA Obligations and the Limits of International Nuclear Law

The primary international instrument is the Convention on Nuclear Safety (1994), which obliges contracting states to maintain safe nuclear installations. The Vienna Convention on Civil Liability for Nuclear Damage and its 1997 Protocol create a channelling regime under which the operator of a nuclear installation bears exclusive liability for nuclear damage, regardless of fault. Ukraine is a party to both instruments.

Critically, however, these conventions were designed for peacetime accidents. The Vienna Convention contains a conflict exclusion: damage caused directly by an armed conflict, hostilities, civil war or insurrection falls outside the operator's mandatory liability. That exclusion is not a technicality. It means that if a drone strike on Chernobyl triggers a radiological release and causes economic or physical harm across borders, the treaty-based compensation channels that businesses might instinctively rely on will likely be unavailable.

The gap is not filled by the Treaty on the Non-Proliferation of Nuclear Weapons or by UN Security Council resolutions, none of which create private rights of action for commercial counterparties. The legal exposure therefore falls back onto national law and, critically, onto the contract itself.

Force Majeure Clauses: What They Cover and Where They Fail

Most commercial contracts include a force majeure clause that excuses performance when an extraordinary event beyond a party's control prevents fulfilment of obligations. War and acts of armed conflict are standard enumerated triggers in well-drafted clauses. A drone attack on a nuclear site would ordinarily satisfy that threshold.

The difficulty lies in causation and foreseeability. In jurisdictions applying English law, force majeure is a creature of contract: courts will ask whether the event was specifically covered by the clause's language, whether it actually prevented (rather than merely hindered) performance, and whether the affected party took reasonable steps to mitigate. Continental civil law systems, including those of France, Germany and the Netherlands, incorporate statutory frustration or hardship doctrines that offer somewhat more flexibility, but still require a causal link between the specific event and the specific obligation that cannot be performed.

For contracts with Ukrainian counterparties, or contracts whose supply chains pass through regions that could be affected by radiological contamination, the current Chernobyl situation creates a foreseeable risk. Once a risk is foreseeable, courts in many jurisdictions will hold that it should have been allocated in the contract. Failure to do so can leave both parties in an uncomfortable legal limbo.

Which Sectors Face Immediate Contract Review Obligations

Several categories of commercial agreement demand urgent attention. Energy offtake agreements that reference Ukrainian grid capacity or cross-border electricity transmission are directly exposed to both physical disruption and regulatory suspension. The European Network of Transmission System Operators has protocols for emergency isolation that can unilaterally alter contractual delivery obligations.

Logistics and freight contracts covering Eastern European corridors need to be examined for notice obligations and rerouting cost allocation. Agricultural commodity contracts referencing Ukrainian origin goods carry contamination risk provisions that may or may not address radiological events specifically. Financial agreements, particularly trade finance facilities and letters of credit governed by UCP 600, contain force majeure exclusions that banks interpret narrowly.

Insurance and reinsurance programmes are a separate priority. Most property and casualty policies contain absolute nuclear exclusions. Business interruption cover triggered by a nuclear event at a third-party site, rather than the insured's own premises, sits in a particularly uncertain position and should be tested against policy wording before an event occurs rather than after.

Jurisdiction-by-Jurisdiction Contract Drafting Priorities

For contracts governed by English law, counsel should insert a specific enumerated trigger covering "radiological contamination events arising from attacks on nuclear installations" and should define the geographical scope explicitly. Boilerplate war clauses drafted in the 1990s will not necessarily capture the precise scenario now unfolding.

Under New York law, frustration of purpose doctrine is applied restrictively, and courts will scrutinise whether the risk was allocated at the time of contracting. New York-governed contracts should include explicit material adverse change provisions that are tied to regulatory prohibition rather than commercial inconvenience.

German and French civil law contracts benefit from statutory hardship provisions (Wegfall der Geschäftsgrundlage under the BGB; imprévision under French civil code reforms enacted in 2016), but these apply only when performance remains technically possible yet fundamentally inequitable. Counsel should not assume these doctrines will do the work that proper drafting should accomplish.

Singapore and Hong Kong governed contracts, frequently used for commodity and trade finance transactions with Eastern European exposure, follow English common law closely. The same drafting discipline applies.

Practical Steps GCs Should Take Before the Risk Crystallises

The window between a foreseeable risk and an actual event is precisely when contractual remediation is possible. General counsel should conduct a contract inventory focused on three criteria: geographic exposure to affected regions, dependency on supply chains that could be disrupted by a radiological event, and the adequacy of existing force majeure and material adverse change language to cover the specific scenario.

Where gaps are identified, reopening contracts for amendment is preferable to relying on implied terms or statutory doctrines. Counterparties in most jurisdictions will understand the commercial logic of updating force majeure language in the current environment. Contracts that cannot be amended should be flagged for heightened monitoring and contingency planning.

Adira's contract intelligence tools can scan an entire agreement portfolio against a defined risk taxonomy, surface clauses that are silent on radiological or nuclear events, and generate jurisdiction-appropriate redlines that reflect each governing law's specific requirements. That kind of systematic review, done now, is materially more defensible than a reactive scramble after an event has already occurred.