Pope Leo XIV calls for nuclear disarmament in new book on peace

Pope Leo XIV has warned that nuclear weapons do not generate peace and called for disarmament in the preface of his new book 'Desarmada y desarmante' (Disarmed and Disarming), released July 21, 2026. The pontiff, who is on vacation at Castel Gandolfo, argues that the current arms race 'frightens and terrifies' and that peace is built on truth, not weapons Source: elcaribedr.

The book, published by the Vatican Publishing House, is the first anthology of his speeches on peace since his election in May 2025. In it, the Pope cites the Global Peace Index, noting that 103 countries are involved in some form of conflict Source: clarin. He criticizes those who wage war 'in the name of peace' and warns against a world where machines decide to bomb civilians Source: hoydo.

Key messages

• Nuclear disarmament is essential: 'In the atomic age, truth must prevail: it is not nuclear weapons that generate peace, but disarmament' Source: infobae.
• Peace begins with individuals: The Pope states that peace is a responsibility starting with each person, warning that judging others leads to hatred Source: elcaribedr.
• Technological threats: He raises concern about artificial intelligence and cyber warfare, asking whether humanity can continue inhabiting Earth if machines control weapons Source: clarin.

Context and reactions

The Pope recalls the 1983 incident where Soviet officer Stanislav Petrov prevented a nuclear war, emphasizing that individual conscience can save the world Source: infobae. He also cites his predecessor Francis and John Paul II, urging a return to a path of disarmament and hope. The book comes amid rising global tensions and a perceived nuclear arms race Source: hoydo.