The Russian invasion of Ukraine has become a protracted war between Ukraine and Russia, with elements of a new Cold War where Ukraine’s western Allies are fighting Russia by proxy through the supply of weapons and other aid through the NATO alliance. The just war standard of “reasonable chance of success” is not part of the original theory devised by Saint Augustine or St. Thomas Aquinas, but a later innovation made by Francisco Suárez to prevent wars from deteriorating into a long cycle of revenge by parties at war.
It should be uncontroversial that the Ukrainians have a right to defend their people and their land. However, some have argued that Pope Francis is spearheading a rejection of the just war tradition, replacing it with a thoroughgoing pacifism that would in principle deny this right to the Ukrainian defenders. As an analysis of the Pope’s position, I think this is mistaken.
No doubt there are complex reasons of history and diplomacy behind such qualifications and hesitations. But it is accurate to say that they reflect the increasing Catholic skepticism about the moral justification of war at all. But the Ukrainian decision to fight presents an important challenge to that skepticism.
