- Three companies affiliated with Navitas Petroleum
- JHI Associates
- Eco (Atlantic) Oil & Gas
- Directors, managers, shareholders and representatives involved in the project
Buenos Aires argues that the companies are exploiting natural resources in waters claimed by Argentina without authorization under Argentine law. The government said it would continue taking measures against activities that breach the country’s claimed sovereign rights.
Argentine environmental lawyers and veterans of the 1982 Falklands War have also filed a separate preventive lawsuit, according to EFE and La Nación. That action targets Navitas and Rockhopper Exploration and seeks an immediate halt to construction and financing.
Why has Javier Milei intensified the dispute?
President Javier Milei announced the tougher approach during a televised national address days before the legal threat. He called oil development around the islands a “clear and urgent danger” to Argentine sovereignty and said companies involved would face sanctions.
“The Malvinas are Argentine, historically and legally,” Milei said, using Argentina’s name for the islands. “There’s no debate about that.” He also claimed that the “winds of change” favoured Buenos Aires, although the British government responded that its position remained “unwavering.”
Milei rejected the outcome of the Falkland Islands’ 2013 referendum, in which 99.8% of voters chose to remain a British overseas territory. He argued that residents living on territory “usurped” by Britain had no legitimate right to self-determination.
That position is standard Argentine policy, but the threat of prosecution marks a sharper turn for Milei. Argentine veterans have previously accused him of being too accommodating toward Britain while he pursued stronger diplomatic relations with London.
He has now instructed Economy Minister Luis Caputo to prioritize an integrated naval base and other strategic projects in Argentina’s 2027 budget. The shift suggests this is more than one forceful speech followed by a quiet return to diplomatic pleasantries.
What is the Sea Lion oil project worth?
Sea Lion lies in the North Falkland Basin, roughly 130 miles, or 209 kilometres, from the islands. The Falkland Islands government approved its development, and the partners reached a final investment decision in December 2025.
Navitas holds a 65% operating stake, while Rockhopper owns the remaining interest. According to Rockhopper, the first phase is expected to:
- Cost about $2.06 billion
- Recover approximately 170 million barrels
- Produce around 50,000 barrels a day at peak output
- Deliver first oil in March 2028
Navitas lists 314 million barrels of certified reserves across the first two phases. Across five possible phases, it reports 726 million barrels of discovered reserves and contingent resources. Those figures are substantially below the widely repeated estimate of 1.7 billion barrels for the field, although the numbers use different classifications and development assumptions.
The project could transform the islands’ finances. A Navitas-commissioned assessment forecasts £3.6 billion in taxes and royalties for the Falkland Islands government through 2057. With the territory’s gross domestic product estimated at about £280 million in 2023, economic activity could nearly triple at the project’s peak. That scale also explains why environmental opponents are trying to stop financing before production begins.
What do Navitas and Rockhopper say?
Navitas and Rockhopper said in a joint response reported by the Associated Press that their licences were lawfully granted by the Falkland Islands government and continued to have support from the United Kingdom.
The companies said Argentina’s measures were not expected to materially affect development work or the timetable. For now, they still expect production to begin in 2028.
Their answer reflects the basic legal collision behind the dispute. Argentina says any exploitation of resources in the surrounding waters requires its permission because it claims sovereignty over the islands. The companies rely on licences issued by the Falkland Islands authorities, backed by Britain.
The sovereignty argument remains rooted in the 1982 war, when Argentine forces invaded the islands and a British military task force retook them. More than four decades later, Argentina continues to claim the territory, Britain maintains that residents should determine their own future, and the islanders have overwhelmingly chosen British status.
Oil has now increased the financial stakes considerably. Neither government has changed its core position, but Sea Lion gives both sides a deadline and several billion reasons not to lower the temperature.
Why has the dispute acquired an Israeli dimension?
Navitas is listed in Tel Aviv, making Argentina’s planned prosecution unusually awkward given Milei’s close alignment with Israel. The situation became stranger when Israeli National Security Minister Itamar Ben Gvir urged Prime Minister Benjamin Netanyahu to recognize Argentine sovereignty over the islands.
Ben Gvir accused Britain of taking Argentine territory and oil, and called for sanctions against the UK “for as long as the occupation continues.” His intervention placed a senior Israeli minister firmly behind Buenos Aires while an Israeli operator remained the principal investor in the project Argentina wants stopped.
There has been no reported change in Israeli government policy, and Navitas has shown no intention of withdrawing. Still, the episode adds another diplomatic layer to a dispute already involving Argentina, Britain, the Falkland Islanders and several international energy companies.
The immediate question is whether Buenos Aires converts its announcement into a clearly documented federal case. The larger question is whether legal threats can delay a project that already has local approval, committed investors and a March 2028 production target. At present, Argentina is promising prosecution while the companies are promising oil. Both appear confident that their preferred map is the legally relevant one.
