This article explores the question whether the territorial application of a treaty extends to unlawfully annexed territory. In this context, it examines State succession and the territorial application of treaties under general international law, as well as the moving treaty-frontiers rule and the extraterritorial application of certain treaties, specifically with respect to annexed territory. The article concludes that, while in some cases there is scope to find that a treaty applies extraterritorially in annexed territory, notably as a result of its object and purpose or its provisions, there may also be room, subject to the provisions of the treaty, for a limited form of treaty succession in such territory. Limitations to the obligation of collective non-recognition offer theoretical and practical support for this position.
