Here are some of the landmark cases decided by the ICJ:

1. Corfu Channel Case (1949): This was the first case heard by the ICJ, and it involved a dispute between the UK and Albania over the legality of the UK’s mine-sweeping activities in Albanian waters. The court found that the UK had violated Albania’s sovereignty and awarded Albania compensation.

2. Nottebohm Case (1955): This case involved a dispute between Liechtenstein and Guatemala over the nationality of a German man, Friedrich Nottebohm, who had obtained Liechtenstein citizenship shortly before the outbreak of World War II. The court held that Liechtenstein’s grant of citizenship was not sufficient to confer diplomatic protection on Nottebohm, and that he remained a German national.

3. South West Africa Cases (1962-1966): These cases involved a dispute between Ethiopia, Liberia, and other African states, and South Africa, which had occupied the territory of South West Africa (now Namibia) in defiance of a UN mandate. The court held that South Africa’s occupation was illegal and ordered it to withdraw from the territory.

4. Nicaragua Case (1986): This case involved a dispute between Nicaragua and the United States over US support for the Contra rebels in Nicaragua. The court found that the US had violated international law by supporting the Contras and by laying mines in Nicaraguan harbors.

5. Bosnia and Herzegovina v. Serbia and Montenegro (2007): This case involved a dispute between Bosnia and Serbia over allegations of genocide during the Bosnian War. The court found that Serbia had not committed genocide, but had failed to prevent genocide from occurring and was therefore liable for its failure to act.

The court’s decisions have had significant impacts on international law and relations, and its jurisprudence continues to shape the development of international law today.