President Donald Trump’s directive to resume U.S. nuclear weapons testing – the first in more than 30 years – has reignited not just geopolitical fears but also a sobering question for the insurance industry: what happens when risk moves beyond the realm of insurability?
In his announcement, Trump cited the need to “keep pace” with the nuclear ambitions of Russia and China. Yet, beyond the diplomatic fallout, the call underscores a more immediate reality for insurers and brokers – that certain risks, particularly nuclear-related and war-adjacent exposures, are fundamentally excluded from standard commercial coverage.
Nuclear testing sits squarely outside the boundaries of conventional underwriting. From catastrophic contamination to geopolitical upheaval, the potential losses defy actuarial modeling. Under virtually all commercial property and casualty (P&C) policies, nuclear events are excluded through absolute pollution and war exclusions – clauses designed to insulate carriers from systemic, civilization-scale losses.
These exclusions, once academic, are becoming operationally relevant again. If nuclear tensions rise, energy, logistics, aviation, and reinsurance markets could see cascading effects – from disrupted supply chains and market volatility to investor flight and reduced capacity for high-risk sectors.
“Nuclear incidents are the very definition of uninsurable,” said one industry analyst. “They’re not just catastrophic – they’re existential. The underwriting language was never designed to absorb state-level, global-impact events.”
The renewed nuclear rhetoric comes as the insurance industry is already re-examining the breadth of war exclusions in the cyber, political risk, and property markets. The line between state-sponsored aggression and private-sector fallout has blurred – and insurers are taking note.
“We’ve been watching the war exclusions very closely,” said Eric Schmitt, CISO at Sedgwick. “If you look back to what happened with NotPetya – where what could be argued as an attack by a nation-state against another nation-state took down a number of different companies, wholly unrelated – the war exclusions are now taking a much broader brush than what they have in the past.”
That precedent has reshaped policy language across multiple specialty lines. Cyber, energy infrastructure, and marine insurers have tightened exclusions, clarifying that even indirect losses from acts of war or nuclear contamination fall outside coverage. In reinsurance, the conversation has shifted toward capital resilience and event aggregation – particularly in the face of potentially simultaneous geopolitical and environmental triggers.
Nuclear escalation sits squarely outside the realm of insurable risk. For brokers and clients alike, this moment underscores a fundamental truth: insurance exists to absorb the unpredictable – not the inevitable. Acts of God and acts of war have always marked the boundaries of coverage, reminding markets that some events defy both modeling and indemnity.
The absolute exclusions that shield carriers from nuclear, radiological, and war-related losses are not legal footnotes – they are the bedrock of commercial P&C underwriting. From property to energy, aviation to reinsurance, these exclusions define the edges of the industry’s promise. When state actions or weapons testing enter the equation, the entire notion of shared, transferable risk collapses.
For the insurance community, Trump’s call to resume testing is a reminder of where the insurance contract ends – and where the uninsurable begins.
