Related Rule
Practice Relating to Rule 160. Statutes of Limitation
In 1967, during a debate in the Third Committee of the UN General Assembly on the question of the punishment of war criminals and of persons who have committed crimes against humanity, the Ukraine stated:
The Committee’s task was not to establish a new system of judicial procedure, but to confirm in a multilateral international treaty a generally recognized principle of international law, namely, the non-applicability of statutory limitation to war crimes and crimes against humanity … Statutory limitation … was of an exceptional nature and could only apply when the law so indicated. War crimes and crimes against humanity did not come in the category of ordinary crimes and because of the social dangers involved the principle of statutory limitation was not equally applicable to them. 
Ukraine, Statement before the Third Committee of the UN General Assembly, UN Doc. A/C.3/SR.1517, 16 November 1967, § 5.