The International Court of Justice
The International Court of Justice (ICJ) issued a legal opinion on the legality of nuclear weapons, which says that the threat or use of force by means of nuclear weapons may be legal in extreme circumstances of self-defence. Though, it would generally be contrary to the rules of international law applicable in armed conflict, and in particular the principles and rules of humanitarian law. The decision of ICJ did not outlaw nuclear war, and so many say it in fact legitimized use of nuclear weapons.