1 International organizations may only exercise those powers that have been given to them, either when they were created or subsequently. This fundamental rule of the law of international organizations is called the principle of attributed powers, or the principle of conferred powers, or the principle of speciality; often also the French expression compétences d’attribution is used. As the International Court of Justice (ICJ) has stated in its 1996 Legality of the Use by a State of Nuclear Weapons in Armed Conflict (Advisory Opinion) (‘Nuclear Weapons in Armed...
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