Russian forces occupied Bucha, on the outskirts of Kyiv, for just under a month. Across those 29 days in early 2022, they committed acts of such barbarity that this Ukrainian town will forever be synonymous with war crimes; this conflict’s Srebrenica. Residents were killed and tortured in their hundreds; more than 100 were buried in a mass grave outside the Orthodox Christian church. Others were murdered as they fled. The basement of a children’s summer camp was converted into a torture chamber where women and children were systematically raped. Soldiers slashed throats, mutilated victims and killed parents in front of...