There should be no impunity for Russia’s slaughter of POWs

This horrific event on July 29 led immediately to dueling accusations as Ukraine and Russia blamed each other. With each passing day, however, evidence — direct and circumstantial — mounts that this was, indeed, a premeditated massacre by Russia. As such, it would rank as one of the worst war crimes yet, in a war marked by the atrocity with which Russian President Vladimir Putin’s troops have waged it. There must be an investigation, followed by full accountability for the perpetrators, lest international law on treatment of prisoners of war become another casualty of Mr. Putin’s aggression.