Leo said peace cannot rest on atomic arsenals, arguing disarmament—not nuclear weapons—is the only credible path as conflicts involve 103 states worldwide.
The Vatican message, drawn from his book “Unarmed and Disarming,” warns that a renewed arms race and the fusion of cyber capabilities with rearmament have made nuclear risk more acute.
Hiroshima and Nagasaki showed war is an “adventure with no return,” Leo said, citing decades of de-escalation now eclipsed by fresh military buildups.
Stanislav Petrov’s 1983 decision not to report a false missile alert near Moscow illustrated how close the world has come to catastrophe—and how much still depends on human conscience.
Leo framed peace as both a personal duty and a global imperative, urging daily non-violence, diplomacy and hope amid wars from Ukraine and the Middle East to Sudan and Myanmar.
Can the first American Pope's call for 'moral mobilization' actually succeed in reversing the new global arms race?
With the Pope declaring 'just war' theory outdated, what does this mean for the future of modern, high-tech warfare?
As the Pope warns against AI weapons, can moral authority influence global policy faster than the technology itself advances?
Pope Leo XIV’s Call for Global Nuclear Disarmament: Political Fallout, U.S. Tensions, and the Catholic Church’s Moral Reckoning in 2026
Overview
Pope Leo XIV’s new book, 'Disarmed and Disarming: Peace Is a Gift,' calls for global nuclear disarmament and non-violence, building on the Holy See’s long-standing opposition to nuclear weapons. He highlights the contradiction of leaders waging war for peace and reflects on the tragedies of Hiroshima and Nagasaki, warning that war is now an 'adventure with no return.' This message, consistent with the Vatican’s support for the UN Treaty on the Prohibition of Nuclear Weapons, has sparked immediate political fallout in the U.S., challenging current policies and igniting debate about the true path to peace.