This article examines the existence, nature, and content of the non-intervention principle in contemporary international law, concentrating on the application of the principle to areas other than the use of force. It looks at the historical development of the principle and the sources and evidence of the law, in particular resolutions of the UN General Assembly, the decisions of the International Court of Justice, and the practice of states. The article then considers some specific treaty-based applications of the principle, and explores how far the principle may apply to non-treaty, non-forcible situations. It next considers a number of circumstances that may preclude the wrongfulness of intervention (Security Council authorization, consent, and countermeasures), before drawing some tentative conclusions.
