Practice Relating to Nuclear Weapons
In 1996, during a debate in the First Committee of the UN General Assembly, Chile stated:
It is not accurate to say that the International Court of Justice accepted that self-defence constitutes an exception to the prohibition on the threat or use of nuclear weapons.
It is not simply the doctrine of the Court but also a progressive trend in the international community, as considered in treaties and in the practices of States, that are contributing to establish a basis for this obligation, which is incumbent upon all countries. Specific and realistic ways and means of addressing that challenge may be open to discussion, but not the basic premise of the obligation to negotiate. Some delegations have given quite interesting and specific examples of concrete initiatives to put this process into practice, but it is important to understand that there can be no areas here that are exclusive, reserved or off-limits to the action of the international community. 
Chile, Statement before the First Committee of the UN General Assembly, UN Doc. A/C.1/51/PV.22, 14 November 1996, p. 11.