Concours Charles Rousseau 2026

Public international law emerged from a long tradition stretching from the Peace of Westphalia (1648) through the Hague Conventions and the post-1945 UN Charter system, which established sovereign equality, the prohibition on the use of force, and the peaceful settlement of disputes as foundational norms. The International Court of Justice, created as the principal judicial organ of the United Nations, together with treaty-based regimes and customary international law, has since structured how states resolve boundary disputes, treaty interpretation questions, and questions of state responsibility codified by the International Law Commission's 2001 Articles. In recent decades the field has been stressed by the proliferation of non-state actors, asymmetric armed conflicts, unilateral sanctions regimes, and contested invocations of self-defence under Article 51. High-profile ICJ proceedings — including South Africa v. Israel on the Genocide Convention, Ukraine v. Russian Federation, and the advisory opinion on the legal consequences of Israel's policies in the Occupied Palestinian Territory — have placed the Court at the center of debates over compliance, jurisdiction, and the relationship between the Court and the Security Council. Today the central dispute concerns whether the post-1945 legal order can adapt to multipolar geopolitics without fragmenting. States disagree on the reach of universal jurisdiction, the legality of countermeasures, the binding force of provisional measures, and the proper interaction between international criminal tribunals and domestic courts. The Concours Charles Rousseau exercise typically asks pleaders to apply these doctrines to a fictional inter-state dispute, requiring close engagement with treaty law, customary norms, and ICJ jurisprudence.

The modern law of the sea was consolidated in the 1982 United Nations Convention on the Law of the Sea (UNCLOS), which codified the territorial sea, contiguous zone, exclusive economic zone, continental shelf, and the regime of the high seas, while creating the International Tribunal for the Law of the Sea (ITLOS), the International Seabed Authority, and the Commission on the Limits of the Continental Shelf. UNCLOS built on the earlier 1958 Geneva Conventions and resolved decades of disputes over coastal-state jurisdiction, but left several questions — including the status of historic rights and the delimitation of overlapping maritime zones — to be worked out in practice. Major flashpoints have since tested the regime. The 2016 South China Sea arbitral award rejected China's nine-dash-line claim but was not accepted by Beijing, illustrating the limits of compulsory dispute settlement. Arctic states are advancing extended continental shelf submissions as ice retreats, while ITLOS issued a landmark 2024 advisory opinion confirming that greenhouse gas emissions constitute marine pollution under UNCLOS. The 2023 Agreement on Biodiversity Beyond National Jurisdiction (BBNJ) introduced new obligations for the high seas, and deep-seabed mining negotiations at the ISA remain unresolved. Today the central disputes involve maritime delimitation between neighbouring states, the lawfulness of restrictions on innocent and transit passage, the protection of submarine cables and critical infrastructure, the scope of coastal-state enforcement against IUU fishing, and the integration of climate obligations into the UNCLOS framework. Charles Rousseau pleadings frequently turn on the interplay between UNCLOS, customary law, and the jurisprudence of ITLOS and Annex VII tribunals.

The international human rights regime took shape after 1945 with the Universal Declaration of Human Rights (1948) and the twin 1966 Covenants on Civil and Political Rights and on Economic, Social and Cultural Rights, supplemented by specialized treaties on torture, racial discrimination, women's rights, children's rights, and enforced disappearance. Regional systems — European, Inter-American, and African — added binding adjudication, while the UN Human Rights Council, its Universal Periodic Review, and the OHCHR Special Procedures developed monitoring mechanisms. Customary norms such as the prohibition of torture and the principle of non-refoulement now bind even non-party states. The regime has faced sustained challenges: contested invocations of cultural relativism, the securitization of migration, shrinking civic space, and the erosion of the universality consensus in a more polarized General Assembly. Recent ICJ proceedings under the Genocide Convention and CERD, the ITLOS and ICJ advisory opinions on climate obligations, and the 2022 General Assembly recognition of the right to a clean, healthy and sustainable environment (Resolution 76/300) have expanded the substantive reach of human rights law into environmental and technological domains. Current debates concern the extraterritorial application of human rights treaties, business and human rights obligations, the regulation of generative AI and online expression under ICCPR Article 19, and the rights of climate-displaced persons who fall outside the 1951 Refugee Convention. For Charles Rousseau, contentious cases often pit treaty interpretation against state-responsibility doctrine, raising questions about reparations, provisional measures, and the relationship between domestic remedies and international adjudication.