As human rights lawyers, U.S. policymakers and Western allies unite to formally recognize Russia’s aggression in Ukraine as crimes against humanity, physicians have a moral and ethical obligation to add their voices to a call for action. The basic tenet encompassed in our Hippocratic oath is to respect and care for patients, to do no harm — a doctrine which, in our view, extends to those at risk of injury and trauma. Therefore, when barbarous acts are systematically committed against civilians — including torture, rape, forced deportation and executions — we must join legal experts like Oleksandra Matviichuk to hold...