James Gow observed in his book War and War Crimes that, while many war crimes are so obvious that most people "know them when we see them," the very existence of the concept of a war crime gives meaning to a critical, if somewhat paradoxical premise: Even in war, there are rules. In this week's episode of Horns of a Dilemma, University of Texas Law School Professor Derek Jinks discusses the legal landscape that developed after World War II, which defines the modern concept of war crimes. He also discusses options for investigation, jurisdiction, and accountability for the many apparent war crimes being committed by Russian forces in their invasion of Ukraine. This discussion was sponsored by the Strauss Center for International Security and Law at the University of Texas, Austin.