Argentina has asked an international maritime tribunal to order a halt to offshore oil development near the Falkland Islands, prompting the British government to reaffirm its support for the islanders and announce measures intended to protect businesses from Argentine legal pressure.
President Javier Milei’s government confirmed on Tuesday 13 October 2026 that it had requested provisional measures from the International Tribunal for the Law of the Sea (ITLOS), based in Hamburg. The request concerns the Sea Lion oil project in the North Falkland Basin.
What has Argentina requested?
Buenos Aires wants the tribunal to prevent the start or continuation of hydrocarbon exploitation while a separate arbitration process under the United Nations Convention on the Law of the Sea proceeds. Argentina argues that the activity infringes what it considers its sovereign rights over the continental shelf.
The request follows Argentina’s announcement on 28 September that it was initiating arbitration and giving the UK two weeks to prevent the disputed activity. Argentina maintains a sovereignty claim over the Falkland Islands, which it calls the Malvinas. Britain rejects that claim and supports the islanders’ right to self-determination.
British government rejects Argentine jurisdiction
Foreign Office minister Uma Kumaran told MPs that lawful commercial activity in the Falkland Islands remains lawful and that the UK stands behind those engaged in it. The British position is that the Sea Lion field lies on the Falkland Islands’ continental shelf and is regulated by the islands’ democratically elected government.
The minister said the UK would engage with the international legal process but stressed that Argentina’s application is not a court ruling. It does not invalidate licences granted by the Falkland Islands Government or require work on the project to stop.
Separately, the UK government announced plans for protective measures aimed at shielding businesses and individuals from Argentine domestic measures directed at lawful economic activity linked to the islands. Ministers characterised Argentina’s approach as economic coercion; that description represents the UK government’s position.
What is the Sea Lion project?
Sea Lion is a planned offshore oil development north of the Falkland Islands involving Navitas Petroleum and Rockhopper Exploration. The project has been presented as a potentially important source of future revenue for the islands. Its developers have indicated that they do not expect Argentina’s legal action to derail development.
The dispute is taking place against the background of Argentina’s longstanding sovereignty claim and the UK’s commitment to the Falkland Islanders’ expressed wish to remain a British overseas territory.
Has the tribunal ordered work to stop?
No. As of 13 October, Argentina has requested provisional measures. There is no reported tribunal order halting Sea Lion, and the legal merits of the competing positions have not been determined in these proceedings. The UK says the existing licensing and regulatory arrangements remain in effect.
Sources
- UK Government: Businesses set to be protected from Argentinian economic coercion (13 October 2026)
- Argentine Government: Official announcement of Sea Lion arbitration (28 September 2026, Spanish)
- Reuters: Argentina seeks tribunal order against UK oil activity near Falklands (13 October 2026)
- Associated Press: Argentina takes Falklands oil dispute to international tribunal (13 October 2026)