ICJ Advisory Proceedings

The advisory jurisdiction of the International Court of Justice (ICJ) is grounded in Article 96 of the United Nations Charter and Articles 65–68 of the ICJ Statute. Article 96(1) authorizes the General Assembly and the Security Council to request an advisory opinion "on any legal question," while Article 96(2) permits other UN organs and specialized agencies, when so authorized by the General Assembly, to request opinions on legal questions arising within the scope of their activities. The Court's Rules of Court (as revised in 1978 and subsequently amended) elaborate the procedure in Articles 102–109. Unlike contentious cases between states, advisory proceedings produce non-binding opinions — yet their authoritative interpretation of international law has shaped doctrine on decolonization, the use of force, treaty interpretation, and the law of international organizations.

Proceedings commence when an authorized organ transmits a written request to the Registrar, accompanied by all documents likely to throw light on the question (Statute Article 65(2)). The Registrar immediately notifies all states entitled to appear before the Court and identifies, through the President, those states and international organizations likely to be able to furnish information on the question (Article 66(1)–(2)). A time-limit is fixed for the filing of written statements and, subsequently, written comments on the statements of others. Oral proceedings follow, at which states and organizations present their views before the full bench in The Hague. The Court then deliberates in camera and delivers its opinion in open court, with separate and dissenting opinions appended in the manner of contentious judgments.

Several procedural variants warrant attention. Under Article 68 of the Statute, the Court applies the provisions governing contentious cases "to the extent to which it recognizes them to be applicable" — meaning ad hoc judges may be appointed where the advisory request relates to a legal question actually pending between two or more states, as occurred in the Western Sahara opinion (1975). Article 103 of the Rules permits expedited treatment when the requesting organ asks for an "urgent answer." A distinct regime governs review of judgments of the UN Administrative Tribunal and certain ILO Administrative Tribunal decisions, although the UNAT review procedure was abolished in 1995. The Court retains discretion under Article 65(1) — the word "may" — to decline a request, though it has consistently held that only "compelling reasons" justify refusal, a threshold it has never found met since the Permanent Court's Eastern Carelia opinion (1923).

Recent practice illustrates the breadth of the jurisdiction. On 19 July 2024, the Court delivered its opinion in Legal Consequences arising from the Policies and Practices of Israel in the Occupied Palestinian Territory, requested by General Assembly resolution 77/247 of 30 December 2022, finding Israel's continued presence in the OPT unlawful. The Court is presently seized of two further requests: the Obligations of States in respect of Climate Change proceedings, initiated by General Assembly resolution 77/276 of 29 March 2023 on the initiative of Vanuatu, with oral hearings held in December 2024; and an Inter-American Court parallel track on similar questions. Earlier landmark opinions include Legality of the Threat or Use of Nuclear Weapons (1996), Wall in the Occupied Palestinian Territory (2004), Kosovo Declaration of Independence (2010), and Chagos Archipelago (2019).

Advisory proceedings must be distinguished from contentious jurisdiction under Article 36 of the Statute. Contentious cases require state consent — through compromis, compromissory clause, or optional clause declaration — and produce judgments binding under Article 59 and enforceable through Security Council action under Charter Article 94(2). Advisory opinions bind no one in the formal sense, though they may acquire binding force by treaty (the Convention on Privileges and Immunities of the UN, Article VIII Section 30, deems certain advisory opinions "decisive"). They also differ from preliminary references in regional courts such as the CJEU under TFEU Article 267, which arise from concrete domestic litigation rather than abstract questions posed by political organs.

Controversies recur over the politicization of requests, the bypassing of state consent, and the propriety of pronouncing on bilateral disputes through the advisory route. Israel argued unsuccessfully in Wall (2004) and again in 2024 that the questions concerned a bilateral dispute requiring its consent; the United Kingdom raised similar objections in Chagos, contending the request circumvented its non-acceptance of ICJ contentious jurisdiction vis-à-vis Mauritius. The Court has held that the consent principle does not bar advisory jurisdiction because the opinion is addressed to the requesting organ, not the states concerned — a reasoning consolidated in paragraphs 47–50 of the Chagos opinion. Critics including former Judge Schwebel have questioned whether this distinction is sustainable when the advisory finding effectively resolves the underlying dispute.

For the working practitioner, advisory proceedings constitute one of the most consequential mechanisms in the multilateral legal toolkit. Foreign ministries treat the filing of a written statement as a major policy commitment, requiring inter-agency coordination on positions that will be cited for decades — the Nuclear Weapons statements remain authority on nuclear doctrine. Small states and non-state actors such as the African Union and the Organisation of Islamic Cooperation increasingly use advisory requests to internationalize disputes they cannot pursue contentiously, as Vanuatu did on climate. Desk officers should monitor General Assembly Sixth Committee debates on draft requests, assess whether their state should intervene, and recognize that advisory opinions, though formally non-binding, frequently crystallize into customary international law and shape Security Council resolutions, sanctions regimes, and domestic court reasoning.