At a critical phase in Russia’s war on Ukraine, U.N. human rights reports and news accounts illuminate a deepening contrast between the two nations’ adherence to humanitarian conduct amid war, notably in their treatment of prisoners. As Russian forces publicize and celebrate their brutalization of prisoners, Ukraine is striving to apply global norms rooted in a wartime order, 160 years ago this week, by U.S. President Abraham Lincoln. Sustaining support for Ukraine’s adherence to international humanitarian law can help determine which patterns of conduct, brutal or humane, will shape the world in which our children will live.