Western leaders’ horror and fury at the atrocities inflicted on Ukrainian civilians by Russian soldiers is shifting the diplomatic response to Vladimir Putin’s war.

After Moscow agreed to scale back its offensive in parts of northern Ukraine, journalists moved into Kyiv’s suburbs this weekend. What followed were reports of Russian soldiers massacring hundreds of Ukrainian civilians in execution-style killings in the cities of Bucha and Irpin. Accounts of Ukrainian women being raped by Russian soldiers in front of their own children adds to the growing body of evidence describing barbaric war crimes.