Argentine President Javier Milei has escalated territorial tensions with the UK by demanding international arbitration over an offshore oil project (Sea Lion) near the British-controlled Falkland Islands. His government has given the UK a two-week deadline to halt development, threatening to seek emergency intervention from the International Tribunal for the Law of the Sea if it proceeds. This dispute concerns valuable resource rights that could significantly transform the remote South Atlantic archipelago's economy as oil production nears completion in 2028.

The Sea Lion oilfield is being developed by Israel's Navitas Petroleum and England's Rockhopper Exploration; Argentina claims this constitutes illegal resource extraction from disputed territory. The UK maintains that Falkland Islanders have the right to self-determination and resource development, a position supported by a 2013 referendum in which residents voted overwhelmingly to remain a British overseas territory. Milei has taken an increasingly combative stance, backing proposed legislation imposing prison sentences up to 20 years for resource extraction without Argentine authorisation, whilst critics suggest he is leveraging the longstanding sovereignty dispute—one of Argentina's few unifying political causes—to bolster his flagging public support ahead of next year's election.