Argentine leader threatens to sanction oil firms and reiterates Falklands claim

Breaking news from the markets: Argentine leader threatens to sanction oil firms and reiterates Falklands claimImage source, Getty ImagesByWill Grant, 's Mexico, Central America and Cuba correspondent, Chris Graham and Peter Hoskins, Business reporterPublished4 September 2026Argentina's president has heightened tensions with the UK over the Falkland Islands, warning he will impose economic sanctions on firms which exploit oil close to the British overseas territory. In a national address, Javier Milei said the "winds of change" favoured Argentina's claim to the islands, emboldened by signs the US might reconsider its stance of neutrality on the issue. Milei said the Sea Lion oilfield, where a British and an Israeli firm are due to begin exploration work, was a "clear and present danger".

Foreign Secretary Ed Miliband said the UK's position on the islands was "unwavering", and they would remain British as "that is the overwhelming position of the Islanders. "Trump hints US would not back UK over Falkland Islands due to lack of Iran war support Published2 days agoFalklands is a pressure point for the UK – and the US knows it Published24 AprilEarlier Downing Street said reaffirmed its position that the islands would remain a British Overseas Territory "for as long as the Islanders wish". "This is not the first time Argentine governments have made economic threats against the islanders.

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We are clear that the Falkland Islanders' right of self-determination extends to the right to exploit their own natural resources. "More than 40 years after the war over the territory, sovereignty of the archipelago in the south-west Atlantic Ocean remains hotly disputed between Britain and Argentina. Milei announced his sanctions plan surrounded by his cabinet at the presidential palace, reiterating that the Falklands were "historically and legally" Argentinean.

It is not yet clear how or to what extent the sanctions will be imposed or tightened. In Argentina, a current law already allows for restrictions of activities of oil companies participating in projects considered unauthorised on the islands. Defence Secretary Wes Streeting also said Britain's commitment to the Falkland Islands was "absolute and unshakeable".

"Milei's statement overnight tells us more about domestic politics in Argentina than it does about the Falkland Islands," he said on X. In a 2013 referendum, residents of the islands voted overwhelmingly to remain a British overseas territory - with 99. 8% voting in favour and just three voting against.

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Teslyn Barkman, a former member of the Falkland Islands Legislative Assembly, told the that Milei's speech had "probably irked every single Falkland islander". Speaking from the capital Stanley, she added that "we have a burgeoning economy for a small place... we will remain forever British".

The crux was a proposal to introduce a bill to parliament to impose sanctions on energy firms planning to begin oil exploration off the Falklands.

Financial markets are tracking the development closely as investors assess the likely impact.