UK vows to defend Sea Lion oil project as Argentina seeks provisional measures at ITLOS

The United Kingdom told the International Tribunal for the Law of the Sea (ITLOS) it will defend its interests in the Sea Lion oil project, a joint venture between Rockhopper Exploration and Israel’s Navitas Petroleum that aims to start drilling in March 2027 and produce oil in 2028. Attorney General Ellie Reeves said the project could generate billions of pounds for the Falkland Islands and warned that a provisional ruling in Argentina’s favour would deprive the islands of essential revenue.

Argentina filed a complaint on October 13 seeking provisional measures to suspend the drilling, arguing that the development violates a United Nations resolution and its territorial claim over the islands, which it calls Las Malvinas. President Javier Milei said he had ordered the foreign ministry and legal teams to begin arbitration and threatened sanctions against companies involved in the project.

"The provisional measures sought by Argentina would prevent the people of the Falkland Islands from developing their natural resources as they are entitled to do so, pursuant to their fundamental right to self-determination," Reeves told the tribunal.

Argentina’s lawyer Mario Oyarzabal countered that the resources belong to the Argentine people and that the islanders do not have the right to decide the islands’ sovereign status.

The UK’s spokesperson for Prime Minister Andy Burnham said the government is fully engaged in the UNCLOS process and will robustly defend the interests of the Falkland Islanders. Burnham’s office also noted that the issue was raised in a recent call with United States President Donald Trump, emphasizing the economic impact of Argentina’s actions.

Legal scholar Jorge Emilio Nunez said the case reflects deeper sovereignty disputes and will be used for domestic political messaging in Argentina, though voters tend to prioritize economic performance over the territorial issue.