Argentina sets two-week deadline for UK over Falklands oil

President Javier Milei has given the United Kingdom a two-week deadline to stop the Sea Lion oilfield project or face international arbitration. The Argentine leader made the statement on Monday, September 29, 2026, warning that if the 'illegitimate exploitation' of the region does not end, his country would take the matter before the International Tribunal for the Law of the Sea. He has instructed the Foreign Ministry and legal teams to initiate proceedings if work does not stop by the deadline.

Background on the Sea Lion project and licensing

The Sea Lion oilfield is a joint venture between Britain's Rockhopper Exploration and Israel's Navitas Petroleum. It is located approximately 130 miles (209 km) north of the Falkland Islands and contains an estimated 1.7 billion barrels of oil. Production is expected to begin in 2028.

The companies insist they hold valid licences issued by the Falkland Islands authorities. They have rejected Argentina's objections. The UK government has consistently defended the right of the islanders to develop their natural resources.

Historical context of the Falklands sovereignty dispute

Argentina and the UK have long contested sovereignty over the archipelago, which Argentina calls Las Malvinas. The dispute culminated in a 74-day war in 1982 after Argentine forces landed to stake a territorial claim. British forces retook the territory. The conflict resulted in the deaths of 649 Argentine military personnel, 255 British service members, and three islanders.

The UK points to a 2013 referendum in which islanders voted overwhelmingly to remain a British Overseas Territory. Turnout was about 92%, with 99.8% voting in favour. Argentina rejects this vote. President Milei has dismissed the wishes of the islanders, arguing the principle of self-determination does not apply because, in his view, the population was implanted by an occupying power.

International reactions and legal framework

Milei has sharply criticised the United Nations for its inaction. In a speech to the UN General Assembly, he argued the body had chosen 'to look the other way' on the sovereignty issue. He said Argentina was therefore 'going to take matters into our own hands' through legal and economic action. Javier Milei said the UN had become "a useless organisation" which only serves "arrogant parasites dressed up as well-intentioned bureaucrats."

UK officials have responded firmly. Defence Secretary Wes Streeting stated that Argentina 'lacks the ability' to take back the Falklands by force. Argentina argues that Britain's authorization of oil exploration violates a UN resolution calling on both sides to refrain from unilateral actions while their sovereignty dispute remains unresolved. The International Tribunal for the Law of the Sea, the body Argentina plans to petition, is an independent judicial body in Hamburg responsible for applying the UN Convention on the Law of the Sea.

Argentina's broader response to oil exploration

Beyond the legal threat, Argentina has taken other steps. Earlier in September, the government imposed sanctions on people and firms involved in oil exploration around the Falklands. It said it would file a criminal complaint against Navitas Petroleum.

Milei's administration has also sent Congress a sweeping security bill. This proposes prison terms of up to 20 years for extracting resources around the islands without Argentine authorization. It would also enable tougher action and expand the military’s role in protecting critical infrastructure. Milei has threatened to bar involved companies from operating in Argentina's own oil and mining sectors. Argentine authorities say they are investigating at least 60 companies and executives for possible violations.

If the UK does not halt work by the two-week deadline, Argentina will take the matter before the International Tribunal for the Law of the Sea.