Argentina threatens arbitration over Falklands Sea Lion oil project

Argentine President Javier Milei has threatened to take legal action against the United Kingdom over the Sea Lion oil project near the Falkland Islands. In a post on X, he said he had instructed Argentina's Foreign Ministry and legal teams to begin arbitration proceedings. He also warned that if the project is not stopped within two weeks, Argentina will bring the case to the International Tribunal for the Law of the Sea.

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The dispute centres on the Sea Lion field in the North Falklands Basin, about 220 kilometres from the islands. The project is being developed by Navitas and Rockhopper, which say they hold valid exploration licences issued by the United Kingdom. Milei described the project as the illegal exploitation of Argentine resources, while his administration has already taken legal action against the British-authorised development.

The Falkland Islands are administered by Britain but claimed by Argentina, and sovereignty over the territory has been contested for decades. The issue remains politically sensitive because of the 1982 war between Britain and Argentina, in which 255 British troops and 649 Argentine troops were killed. The latest dispute adds a resource dimension to a long-running territorial conflict, with offshore oil exploration now at the centre of the argument.

Argentina says the project breaches a United Nations resolution calling on both sides to avoid unilateral actions in the islands until the dispute is resolved. The British government has said it supports businesses operating near the Falklands and argues that they have the right to develop natural resources as they see fit. That position has underpinned licensing for offshore exploration in the area, including the Sea Lion project.

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The row also comes as Buenos Aires has hardened its stance on the Falklands after comments from US President Donald Trump that Washington was open to reviewing its historically neutral position on the territory. That shift has given the dispute renewed diplomatic visibility, even though the underlying sovereignty claim has not changed. For Argentina, the oil project is not only an economic issue but also a test of its broader claim over the islands and surrounding waters.

What happens next will depend on whether the project is halted within the two-week period set out by Milei. It is not yet clear how quickly any arbitration would begin or whether the International Tribunal for the Law of the Sea would be asked to hear the case. The companies involved have said they believe their licences are valid, and the British position remains that development can continue.

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