This article provides a reappraisal of the International Court of Justice's approach to jurisdiction and applicable law in Nicaragua, 25 years later. In the first phase of the proceedings arising from the US support of the activities of the Contras against the Sandinista government, the Court robustly asserted its jurisdiction despite the US reliance on its multilateral treaty reservation and the subsequent attempted modification of its Optional Clause declaration. At the same time, the Court approached the related question of applicable law with a wide, if not effusive, reliance on multilateral customary international law operating conjunctively with treaty law. The Court's dismissal of negotiations as a procedural precondition for invoking its jurisdiction in Nicaragua is contrasted with its recent findings in Georgia v. Russia.

In the Preliminary Objections phase of this case the Court followed its previous jurisprudence based on the Right of Passage Over Indian Territory case (1957) concerning the operation of Article 36(2) of its Statute. It is argued here that there were compelling reasons why the Court should have reassessed this jurisprudence. The implications of the Right of Passage doctrine for the operation of Article 36(2) and the role of the Court in international affairs are also discussed.

This paper is concerned with the denunciation of declarations of acceptance of the compulsory jurisdiction of the International Court of Justice under the Optional Clause and the impact that the 1984 Judgment of the Court in the jurisdictional phase of the Nicaragua case may have had upon it. In this decision the Court found that the principle of good faith is of paramount importance in the legal regime of the Optional Clause and introduced in that regime the element of a ‘reasonable time’ for the denunciation of declarations of indefinite duration and silent as to termination. The relevant passage of the Judgment is discussed with a view to determine the contours of this requirement and the ways it may operate in practice.