On Thursday, Arthur Mensch, chief executive of French artificial‑intelligence startup Mistral, directly challenged the Vatican’s recent encyclical that calls for the disarmament of AI‑driven weapons. The Pope’s document, released on May 25, urges binding limits on autonomous‑weapon deployment, insists on human‑in‑the‑loop controls, and rejects the traditional just‑war framework as outdated. Mensch, speaking at a press event, countered that Europe cannot step back from defense‑AI research while adversaries continue to field such technologies.
“We’re all for peace,” Mensch said, “but if you look at our rivals and adversaries in the world, they’re using artificial intelligence. As long as we have adversaries that are threatening, we need our own capabilities.” His remarks echo a broader European tech strategy that has intensified since the war in Ukraine, when AI‑enabled systems proved decisive on the battlefield.
The Vatican’s encyclical, titled Magnifica Humanitas, spans 42,300 words and calls for three binding requirements for any autonomous‑weapon system: traceability of decisions, meaningful human control over lethal action, and international rules to slow the AI arms race. It also asserts that military force is justified only in “self‑defence in the strictest sense,” effectively raising the bar for when lethal AI may be deployed.
Mensch’s response is rooted in Mistral’s growing defense‑AI portfolio. Since early 2025, the company has partnered with Helsing, a defense contractor that already fields AI in Eurofighter jets, battlefield simulations, and Ukrainian drone operations. The collaboration, announced at the Paris AI Action Summit in February 2025, focuses on vision‑language‑action models for a new generation of defense systems. Mistral has also been courting contracts with several European governments, signaling that its defense work is not speculative but already commercial.
The clash highlights a subtle but real divergence in how self‑defense is interpreted. Both the Pope and Mensch accept the legitimacy of defending against threats, yet they differ on the practical threshold. The Vatican argues that the bar for deploying lethal AI should be higher than any state has set, whereas Mensch contends that Europe cannot meet credible threats if it adheres to that higher standard while rivals do not.
While the Vatican lacks regulatory authority, its moral framing has resonated with policymakers. The European Commission welcomed the encyclical, and tech giants such as OpenAI, Google, and Microsoft issued statements of respect. Meanwhile, Brussels is moving toward enforceable AI‑warfare regulations, though it has not yet codified the binding restrictions the Pope proposes. Member states are simultaneously expanding defense‑AI procurement budgets, creating a policy tug‑of‑war that will shape the next year of EU AI‑Act enforcement.
Industry observers note that Mensch’s public rebuttal is more than a rhetorical exercise; it is a defense of an existing business line now under moral scrutiny. By positioning Mistral’s stance alongside the Vatican’s moral vocabulary, Mensch acknowledges the growing influence of the encyclical on the policy debate, even as he bets on the defense‑procurement side of the argument.
The outcome of this clash will likely hinge on how quickly European regulators translate the Vatican’s ethical concerns into law and whether defense budgets continue to prioritize AI. For now, Mistral’s CEO makes clear that the company will not abandon its defense projects, even as the Pope calls for a global pause on lethal AI.
This article was written with the assistance of AI.
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