   Under what conditions, if any, may we engage in military intervention aimed at stopping genocide? In recent years this issue has become salient as large-scale human rights violations and suffering unfolded in Rwanda, the Sudan, the former Yugoslavia, and Libya. Against the traditional understanding that respecting state sovereignty requires non-interference, successful arguments were marshaled that there are important responsibilities to protect the vulnerable (International Commission on Intervention and State Sovereignty 2001). Leaning heavily on the conventional conditions contained in the just war framework, the International Commission on Intervention and State Sovereignty argued that we may engage in war aimed at protecting those who suffer at the hands of governments unwilling or unable to stop large-scale human rights abuses. The commission produced an influential report “The Responsibility to Protect” which was accepted by the United Nations in 2005, and the principles contained in the report have guided decisions about recent cases, such as Libya in 2011 and Syria in 2012.