War Crimes Allegations and Contract Risk: What GCs Need to Know About the Russia-Ukraine Conflict and International Humanitarian Law

Why War Crimes Allegations Matter Beyond the Battlefield

When Human Rights Watch warns that a specific military strike may constitute a war crime under international humanitarian law, the consequences extend well beyond the courtroom of public opinion. For general counsel and law firms advising multinational clients, such allegations trigger a cascade of legal obligations: sanctions exposure, human rights due diligence requirements, contract termination rights, and reputational liability that regulators increasingly treat as a governance failure. The Russia-Ukraine conflict has already reshaped the contract landscape more than any single regulatory event in a generation. Each new escalation, including the August 2025 Kyiv strike involving cluster munitions in a residential area, adds another layer of legal complexity that demands fresh analysis.

The core legal issue is straightforward. International humanitarian law, codified principally in the Geneva Conventions and their Additional Protocols, prohibits attacks that fail to distinguish between combatants and civilians. Cluster munitions, by design, scatter sub-munitions across wide areas, making that distinction practically impossible in dense urban environments. Their use is banned outright for the 112 states party to the 2008 Convention on Cluster Munitions. Russia and Ukraine are not among them, but that does not insulate third-party companies or financial institutions from the consequences of being connected to such conduct.

Who Is Bound and by What Rules

The obligations flowing from international humanitarian law bind states as primary actors, but the corporate law picture is considerably more complex. The UN Guiding Principles on Business and Human Rights establish a corporate responsibility to respect human rights, which courts and regulators in the EU, UK, and several other jurisdictions are progressively hardening into enforceable duties. The EU Corporate Sustainability Due Diligence Directive (CS3D), now being transposed across member states, requires large companies to identify, prevent, and mitigate adverse human rights impacts in their operations and value chains. A documented pattern of war crimes allegations against a state actor, confirmed by a credible body such as HRW, is exactly the kind of signal that a CS3D compliance programme must treat as a red flag.

Separately, the sanctions architecture targeting Russia now spans the EU (seventeen packages as of mid-2025), the US Office of Foreign Assets Control, the UK Office of Financial Sanctions Implementation, and regulators in Australia, Canada, Japan, and Switzerland. Each escalation in the conflict, particularly one that attracts formal war crimes scrutiny, has historically preceded a new tranche of designations and sector-specific prohibitions. GCs should treat the current HRW warning as a leading indicator, not merely a headline.

Contract Changes the Conflict Forces on Parties

The Russia-Ukraine war has fundamentally altered how sophisticated parties draft and interpret several key contract provisions. Force majeure clauses are the most litigated example. Courts in England, New York, Singapore, and elsewhere have had to rule on whether sanctions, export controls, or physical conflict constitute qualifying events, and the outcomes have varied significantly depending on the specific language used. Generic references to "acts of war" or "government action" have proved insufficient in many disputes. Precise drafting now requires explicit reference to sanctions designations, regulatory prohibitions, and armed conflict as distinct triggering events, each with its own notice period and mitigation obligation.

Material adverse change clauses in M&A and finance agreements have similarly been stress-tested. Where a target company has Russian counterparties, Ukrainian operational assets, or supply chains transiting the conflict region, buyers and lenders are now insisting on bespoke MAC carve-outs and representations covering sanctions compliance and war crimes exposure. A company that cannot demonstrate clean human rights due diligence across its supply chain faces a genuine risk that a counterparty will invoke such provisions to exit or reprice a deal.

Human Rights Due Diligence as a Contract Obligation

Perhaps the most consequential long-term shift is the contractualisation of human rights due diligence. Large buyers in regulated sectors, including financial services, defence, and energy, are inserting supplier codes of conduct that require counterparties to warrant their compliance with international humanitarian law and to notify buyers promptly if they become aware of any connection to conduct that may constitute a war crime or serious human rights violation. These clauses are no longer aspirational. Breach triggers termination rights, indemnity obligations, and in some cases audit access.

For companies still operating in or adjacent to Russia, maintaining a defensible compliance record requires documented screening of counterparties against sanctions lists, documented assessment of reputational and legal risk associated with conflict-linked activities, and a clear escalation protocol when credible allegations, such as those published by HRW, emerge in the public domain. Failure to maintain that documentation is itself a governance risk that regulators and class-action plaintiffs have demonstrated a willingness to exploit.

What GCs Should Do Before the Next Escalation

The pattern of the Russia-Ukraine conflict is one of periodic, sharp escalations followed by rapid regulatory response. GCs who wait for a formal sanctions announcement or a court ruling before reviewing their contract portfolio will consistently find themselves behind the curve. A more effective posture involves three steps.

First, map all contractual relationships that have any nexus to Russia, Belarus, or the conflict zone in Ukraine, including indirect exposure through parent companies, joint venture partners, and logistics providers. Second, audit the force majeure, MAC, sanctions compliance, and human rights due diligence provisions in each material contract and identify gaps against current best practice. Third, establish a monitoring protocol that treats credible third-party reports of international humanitarian law violations, including HRW's published warnings, as triggers for an internal legal review rather than background noise.

Adira's contract analysis tools are designed to surface exactly these provisions across large contract portfolios, reading each document from the client's perspective and flagging language that may prove inadequate under current conflict and sanctions conditions. In a legal environment where the next escalation is a matter of when rather than if, that capability is not a luxury.