The Falklands oil dispute has intensified after Argentine President Javier Milei threatened international legal action against the United Kingdom unless work on an offshore oil project is halted. Milei has given the UK two weeks to stop the Sea Lion project, which is being developed by Israeli company Navitas Petroleum and British firm Rockhopper Exploration.
In a statement, Milei said Argentina’s Foreign Ministry and legal teams had been instructed to begin international arbitration if the project was not stopped within the deadline. He described the development as an “illegal” exploitation of Argentine resources and said Argentina could also take the matter to the International Tribunal for the Law of the Sea.
Falklands Oil Dispute Raises Legal Pressure
The latest threat adds another chapter to the longstanding sovereignty dispute between Argentina and the UK over the Falkland Islands, which Argentina calls the Malvinas. The islands have been under British administration, while Buenos Aires continues to claim sovereignty over the territory.
Milei’s announcement came shortly after he criticised the United Nations during his address to the General Assembly for what he sees as its failure to resolve the sovereignty issue. The Argentine president has argued that international institutions have not done enough to address his country’s claim.
Argentina’s government has now formally instructed officials to pursue arbitration under Annex VII of the United Nations Convention on the Law of the Sea. The stated aim is to prevent what Buenos Aires describes as unauthorised hydrocarbon exploitation in the North Falkland Basin.
The move comes despite the companies involved maintaining that their licences are valid. Navitas and Rockhopper are proceeding with development under licences approved by the Falkland Islands authorities and supported by the existing UK-administered regulatory framework.
Sea Lion Oilfield Fuels Argentina UK Tensions
The Sea Lion oilfield is located about 220km north of the Falkland Islands and is being developed by Navitas Petroleum, which holds a 65% working interest, while Rockhopper Exploration owns the remaining 35%. The companies have described the field as a major oil resource.
Rockhopper estimates that Sea Lion contains about 1.7 billion barrels of oil in place, while an independent assessment cited by the company identified 500 million barrels of recoverable resources in the field. The project has already received final investment approval for its northern development phases.
Navitas says first oil is planned for March 2028. Development work is already progressing, including preparations for infrastructure and the arrival of a drilling rig in the Falkland Islands, with drilling expected to begin in early 2027.
The Falkland Islands Government approved the development and production programme for the first two phases of the northern Sea Lion development in 2025. The approvals allowed the licences covering the field to move into the exploitation phase.
Falkland Islands Sovereignty Dispute Continues
The Falklands oil dispute is rooted in the broader sovereignty conflict that erupted into war in 1982 after Argentine forces landed on the islands. A British military task force subsequently retook the territory following a 74-day conflict.
The war resulted in the deaths of 255 British military personnel, three islanders and 649 Argentine military personnel. More than four decades later, the sovereignty disagreement remains unresolved.
Island residents overwhelmingly voted to remain a British overseas territory in a 2013 referendum, with 99.8% voting in favour and three people voting against.
The current oil dispute has added an economic dimension to the sovereignty issue as development of Sea Lion moves closer to production. Argentina’s latest move therefore places the UK, the Falkland Islands authorities and the companies behind the project in a renewed international legal and diplomatic dispute.