Against the Odds: Defending Defensive Wars

Most people think that Ukrainian violent resistance to the Russian invasion is morally justified, even if it turns out to be costly: it can’t be straightforwardly impermissible to resist aggression. But this verdict can be questioned. This essay looks at the ‘reasonable prospect of success’ condition in just war theory and the ‘problem of bloodless invasion’ to see whether they present the Ukrainian resistance with justificatory headaches. It is concluded that there is no principled barrier to Ukraine’s resistance, but that civilian and combatant casualties must be taken into consideration. The essay also engages with the more general question of how philosophizing can help us to think about war. On this score, philosophy can help precisely for the reasons that are often the subject of complaint: it keeps a cool head, and it appeals to abstract principles.