Having apparently abandoned war as a device for settling their own quarrels, developed countries, in the wake of the Cold War, have had an opportunity to cooperate to deal with the two chief remaining sources of artificial or human-made death: civil war and vicious regimes. In addition, international law has evolved to allow them to do so, variously conferring legitimacy on most international policing measures even when they involve the use of military force and even when they violate the policed country’s sovereignty.