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⚔️ '''Act of war''' is a standard [[Definition:Policy exclusion | policy exclusion]] found in virtually all [[Definition:Property insurance | property]], [[Definition:Casualty insurance | casualty]], [[Definition:Life insurance | life]], and [[Definition:Reinsurance | reinsurance]] contracts, relieving the insurer of liability for losses arising from armed conflict between sovereign states, military action, invasion, insurrection, revolution, or related hostilities. The exclusion exists because war-related losses are considered uninsurable under conventional [[Definition:Risk pooling | risk pooling]] principles: they are catastrophic, correlated across vast numbers of policies simultaneously, and fundamentally unpredictable in timing, scale, and duration — making it impossible for insurers to price and [[Definition:Reserving | reserve]] for them actuarially. While the precise wording varies by policy form and jurisdiction, war exclusions have been a bedrock of insurance contract design since the early days of [[Definition:Marine insurance | marine]] underwriting, when policies first distinguished between perils of the sea and perils of war.

⚙️ In practice, applying the act of war exclusion is far less straightforward than it might appear. The exclusion typically encompasses not only formally declared wars — which are increasingly rare under modern international law — but also undeclared hostilities, civil war, rebellion, and in some forms, [[Definition:Terrorism | terrorism]]. Determining where legitimate [[Definition:Terrorism insurance | terrorism coverage]] ends and the war exclusion begins has become one of the most consequential coverage questions in modern insurance. The 2022 Russia-Ukraine conflict, for instance, generated significant disputes in [[Definition:Aviation insurance | aviation]], [[Definition:Marine insurance | marine]], and [[Definition:Cyber insurance | cyber]] markets over whether losses — particularly stranded aircraft and disrupted shipping — fell within war exclusion language. In the [[Definition:Lloyd's of London | Lloyd's]] market, the Lloyd's Market Association (LMA) has published updated war, [[Definition:Cyber insurance | cyber]] war, and sanctions exclusion clauses to help [[Definition:Underwriter | underwriters]] clarify coverage boundaries. Similar efforts have occurred across global markets, with particular attention to the intersection of [[Definition:Cyber insurance | cyber]] attacks and state-sponsored operations, where attribution is often uncertain.

🌍 The act of war exclusion shapes the architecture of several specialized insurance markets that exist precisely to fill the gap it creates. [[Definition:War risk insurance | War risk insurance]] — particularly in [[Definition:Marine insurance | marine]], [[Definition:Aviation insurance | aviation]], and [[Definition:Political risk insurance | political risk]] — is written by dedicated [[Definition:Underwriter | underwriters]] and pools, including government-backed facilities like the UK's Pool Reinsurance Company (Pool Re) for terrorism and certain war-related risks, or the U.S. [[Definition:Terrorism Risk Insurance Act (TRIA) | Terrorism Risk Insurance Act]] backstop. In [[Definition:Trade credit insurance | trade credit]] and [[Definition:Political risk insurance | political risk insurance]], the distinction between war, expropriation, and political violence is carefully delineated in policy language. As geopolitical instability intensifies and [[Definition:Cyber warfare | cyber warfare]] blurs the boundary between state aggression and criminal activity, the insurance industry faces ongoing pressure to refine act of war language — balancing the need for clear exclusions with the commercial imperative to offer meaningful coverage to policyholders operating in an increasingly volatile world.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:War risk insurance]]
* [[Definition:Terrorism insurance]]
* [[Definition:Policy exclusion]]
* [[Definition:Political risk insurance]]
* [[Definition:Marine insurance]]
* [[Definition:Cyber insurance]]
{{Div col end}}

Definition:Act of war - Revision history

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