Argentina Gives UK Two-Week Deadline on Falklands Oil Project, Threatens International Court Case

Argentine President Javier Milei posted a two-week ultimatum to the United Kingdom on Monday, September 28, demanding it halt the Sea Lion oil project near the Falkland Islands or face international arbitration.

Milei said he has "instructed the Foreign Ministry and legal teams to initiate international arbitration" and will ask the International Tribunal for the Law of the Sea, a maritime court in Hamburg, Germany, to order a stop to the project if the UK doesn't back down, according to the BBC and Al Jazeera. He called the drilling "the illegal plundering of our resources" and said "Argentina will not stand idly by" as the UK causes "irreversible and irreparable" harm.

Sea Lion is a joint venture between Britain's Rockhopper Exploration and Israel's Navitas Petroleum, located roughly 130 miles from the Falklands and estimated to hold 1.7 billion barrels of oil, according to the BBC. Both companies have said they hold valid exploration licenses issued by the UK and have not budged, per Al Jazeera and the Saudi Gazette.

The tribunal Milei is threatening to use, established under the 1982 UN Convention on the Law of the Sea, can issue legally binding emergency orders. But it has no enforcement mechanism of its own, meaning even a ruling against Britain would depend on London choosing to comply, as Al Jazeera and The New Daily both note.

A Long-Running Fight, Escalating Fast

Argentina calls the islands Las Malvinas and has claimed sovereignty since Britain's 1982 military task force ejected the invading Argentine forces after a 74-day war that killed 649 Argentine troops, 255 British service members and three islanders, according to the BBC and multiple other outlets. Argentina's core argument is that the islands were seized and populated by an occupying power and that international law, including UN resolutions calling for both sides to avoid unilateral action until the sovereignty dispute is resolved, backs its claim to the surrounding resources. The Independent reports Milei made this explicit at the UN, dismissing islander self-determination because, he argued, "the population was implanted by the occupying power on a territory whose sovereignty is in dispute."

Britain's counter is straightforward: in a 2013 referendum, Falklands residents voted 99.8% to remain a British overseas territory, with just three votes against, and the UK says islanders have the right to develop their own resources. The UK government has said it stands behind Rockhopper and Navitas, and Defence Secretary John Healey said Argentina "lacks the ability" to retake the islands by force, according to the BBC and Saudi Gazette.

Milei used his UN General Assembly speech last week to call the UN "a useless organisation" serving "arrogant parasites dressed up as well-intentioned bureaucrats" for failing to act on the Falklands dispute, per the BBC and The Independent. Foreign Minister Pablo Quirno called the arbitration threat a significant step, writing on X that "whoever explores or exploits our natural resources in the Malvinas without Argentine authorisation must face the consequences," according to The New Daily.

Beyond the Tribunal Threat

Argentina's Congress is also weighing a bill Milei's government sent over that would impose prison terms of up to 20 years for extracting resources, including fish, around the islands without Argentine authorization, according to ITV. Argentine authorities say they are already investigating at least 60 companies and executives for possible violations, and an Argentine judge ordered a halt to Sea Lion work pending an environmental review earlier this month, ITV reported.

ITV also notes that critics accuse Milei of leaning on the sovereignty issue, one of the few causes that unites Argentina across party lines, to shore up sagging public support ahead of next year's presidential election as Argentina's economy struggles. That is a contested political read, not an established fact, and Milei's government has not addressed it directly in the reporting reviewed here.

Adding fuel to the fire: President Donald Trump has suggested Washington could reconsider its historically neutral position on Falklands sovereignty and has questioned Britain's ability to defend the territory given its domestic issues, according to The Independent. UK Prime Minister Keir Starmer raised the dispute directly with Trump at the UN and has said Britain "will stand firm in the face of any threats" to the islands' sovereignty.

Rockhopper and Navitas are still targeting first extraction from Sea Lion within roughly two years, with production anticipated around 2028, according to the BBC and The New Daily. Milei's deadline expires in mid-October. Whether Argentina actually files at the Hamburg tribunal, and whether Britain would comply with any order that came out of it, remains unresolved.