Amb. David Scheffer, senior fellow at the Council on Foreign Relations and former U.S. Ambassador at Large for War Crimes Issues who headed the U.S. delegation to the talks on the International Criminal Court during the Clinton administration, and the author of All the Missing Souls: A Personal History of the War Crimes Tribunals (Princeton University Press, 2011), talks about war crimes, the calls for charges against Putin, as well as the wider context of international law and the U.S. reluctance to join the International Criminal Court.