31. Customary international law can be distinguished from treaty law, which consists of explicit agreements between nations to assume obligations.32. The United States itself has not signed UNCLOS, but has accepted all but Part XI as customary international law . 33. The right of self-defense is permitted, when the conditions of customary international law regarding necessity and proportionality are met. 34. It argued that the FTT was " in conformity both with customary international law and EU primary law ". 35. The Court has subsequently held that the UN Charter prohibition on the use of force constituted customary international law . 36. Return of refugees to a territory where they face persecution constitutes . . . a breach of customary international law , 37. It is also an accepted principle of customary international law and is recognised between countries as a matter of practicality. 38. Notably, the four Geneva Conventions establish Hague Conventions, as well as subsequent treaties, case law, and customary international law ." 39. In addition, there are many more body of Customary International Laws ( CIL ) that come into effect when necessary. 40. That group adopted a set of comments on the work of the International Law Commission on identification of customary international law .
