Practice Relating to Nuclear Weapons
Burundi’s Regulations on International Humanitarian Law (2007) states that “there are weapons whose use is prohibited … [such as] nuclear weapons”. 
Burundi, Règlement n° 98 sur le droit international humanitaire, Ministère de la Défense Nationale et des Anciens Combattants, Projet “Moralisation” (BDI/B-05), August 2007, Part I bis, p. 17; see also Part I bis, pp. 2 and 33.
In 1996, during a debate in the First Committee of the UN General Assembly, Burundi stated:
[M]y delegation believes that the Advisory Opinion handed down by the International Court of Justice is very important. It stipulates that the threat or use of nuclear weapons is contrary to the provisions of international law applicable to armed conflict and in particular the principles and rules of humanitarian law. The nuclear Powers should begin negotiations on an international treaty to halt and prohibit the development and production of all nuclear weapons and, ultimately, to destroy all nuclear weapons arsenals, with a view to ensuring that the world is free of nuclear weapons. 
Burundi, Statement before the First Committee of the UN General Assembly, UN Doc. A/C.1/51/PV.13, 24 October 1996, p. 9.