VATICAN CITY: Pope Leo this week repudiated a major teaching used by the Catholic Church since at least the fifth century to evaluate when countries might be justified in waging wars, in a move experts said could have long-reaching impact for global powers. The disavowal of the doctrine came in the pope’s first major document, issued on Monday, which also urged global regulation of AI systems and made the clearest apology yet for the Catholic Church’s historic role in supporting transatlantic slavery.

In first major document, Pope Leo calls for governments to slow AI development with legal safeguards and oversight, rejects just war, theory and apologizes for the Catholic…

Pope Leo XIV’s AI manifesto urges ‘disarming’ artificial intelligence, condemns AI-directed weapons and warns of new forms of slavery and hidden exploitation.

Pontiff appeals to world leaders in lengthy document at Vatican event

Pope Leo XIV apologized for the Catholic Church's legitimization of slavery, saying it was "wound in Christian memory."