UK defends Falklands oil project as Argentina seeks tribunal order to halt drilling
Argentina is seeking provisional measures against the Sea Lion oil development, while Britain says a suspension would threaten billions of pounds in revenue for the Falkland Islands.
By Hiroshi Ferrari ·
Britain has vowed to defend an offshore oil development near the Falkland Islands as Argentina asks an international tribunal to suspend drilling. The challenge, which cites environmental concerns, has brought renewed attention to the countries’ sovereignty dispute over the British overseas territory in the South Atlantic.
The International Tribunal for the Law of the Sea, based in Hamburg, is holding two days of hearings on Argentina’s request for provisional measures. Representing the British government on Tuesday, Attorney General Ellie Reeves argued that blocking the Sea Lion project could cost the islands billions of pounds needed for their economic development. She said Argentina’s challenge was driven by its territorial ambitions and a desire to control the resources.
Sea Lion is a joint development involving Britain’s Rockhopper Exploration and Israel’s Navitas Petroleum, which operates the oilfield. Located roughly 220km, or 137 miles, from the islands, the project is expected to start in March 2027, with production beginning in 2028. Rockhopper estimates that the field contains 1.7 billion barrels of oil in place, including 500 million barrels of recoverable resources.
Argentine President Javier Milei announced steps to block the development in September, directing his Foreign Ministry and legal teams to begin arbitration proceedings against Britain. Argentina formally submitted its complaint to the tribunal on October 13. Milei has also threatened stronger sanctions against participating companies that would prevent them from operating in Argentina’s oil and mining industries.
Argentina maintains that the development breaches a United Nations resolution calling on both countries to avoid unilateral actions in the islands while the sovereignty dispute remains unresolved. Britain has administered the territory since 1833, while Argentina claims the islands, which it calls Las Malvinas. In a 2013 vote, islanders overwhelmingly supported remaining with the United Kingdom.
During the hearing, Reeves argued that islanders were entitled to develop their natural resources under their right to self-determination, according to The Guardian. Argentina’s lawyer, Mario Oyarzabal, said his country respected the inhabitants’ interests and way of life but rejected their right to determine which state the islands belong to. He argued that the resources belonged to Argentina’s people and that the interests of those born on the islands would be considered.
On Monday, Prime Minister Andy Burnham’s official spokesperson said Britain was participating fully in the UN Convention on the Law of the Sea process and would defend its interests alongside those of the islanders. The spokesperson also reiterated that sovereignty was not negotiable. Burnham raised the attempt to block the project with US President Donald Trump last month, discussing the economic implications for Britain and the United States.
The case comes amid wider diplomatic tensions. Milei has pointed to Trump’s refusal to say whether Washington would back Britain in a future Falklands conflict as a sign of a possible shift in Argentina’s favour. With an Argentine election due next year, securing a halt to Sea Lion could also help Milei’s polling position.
