This chapter international law provides panoply of rights and options beyond those that exist by virtue of just domestic law. Comparative law focuses on the domestic laws of individual countries and makes principled distinctions between competing systems and approaches. International law does create certain supranational obligations which are by definition independent of domestic laws and for which provide for international law remedies. Regional treaty alliances, like the North Atlantic Treaty Organization (NATO) or the European Union (EU), offer additional supranational options and support when dealing with terrorism. For instance, in the months following 9/11, NATO invoked the mutual collective self defense provision, arguing that an attack on the United States is an attack on all NATO members. Interpol is considered as the largest police organization in the world, spanning 181 member countries. However, it lacks any enforcement authority, and rather serves as a conduit for information between various countries, often times to locate a suspect.