BUENOS AIRES — Argentine federal judge Mariel Borruto ordered British and Israeli companies to stop developing the Sea Lion oilfield off the Falkland Islands on September 16, 2026. The order bars drilling, offshore installations, and port construction until Argentine authorities conduct an environmental review and issue a decision.

Judge Borruto stated that enforcement of the order depends on international cooperation and the conduct of the companies involved. She gave the parties 10 days to provide information about the status of the project, its contractors, and its financiers. Rockhopper Exploration declined to comment on the injunction. Navitas Petroleum did not immediately respond to requests for comment on the injunction.

The Sea Lion oil project, operated by Rockhopper Exploration and Navitas Petroleum, was initially approved by the Falkland Islands government in 2019, according to the Falkland Islands Government's official website. Commercial oil production for the Sea Lion project is expected to start in 2028. For the Falkland Islands' roughly 3,500 residents, the Sea Lion oilfield promises to transform an economy long dependent on fishing. Rockhopper Exploration has a history of operating in the South Atlantic, including a 2018 agreement with the Falkland Islands government to explore the nearby Alba oil field.

Navitas Petroleum is listed on the Tel Aviv stock exchange. Argentina filed three criminal complaints against Navitas Petroleum and nine other companies and their executives for violating Argentine law by pursuing oil operations without authorization. Argentina launched legal action against Canadian company Eco Atlantic for holding a license to explore next to the Sea Lion field.

A 2011 Argentine law establishes penalties of up to 20 years of disqualification from operating in Argentina and up to 15 years in prison for unauthorized exploration on Argentina’s continental shelf. The law has been used in previous legal actions against foreign companies, including a 2021 case against a Brazilian firm operating in the Malvinas Basin. In 2023, the Argentine government filed a similar legal action against a U.S.-based company, Occidental Petroleum, for conducting seismic surveys in the Malvinas Basin without prior authorization, according to a report from the Argentine Supreme Court.

Argentine President Javier Milei announced measures against companies developing oilfields around the Falkland Islands in a national address on September 3. Milei warned that oil projects around the Falkland Islands posed a "clear and urgent danger" to Argentina’s sovereignty claim. Milei pledged to use all "diplomatic, economic, judicial and legal tools" to defend Argentina's sovereignty claim over the Falkland Islands.

The Argentine administration is preparing legislation to broaden sanctions against companies involved in oil projects around the Falkland Islands. Government spokesperson Adrian Ravier said new legal complaints would be filed against firms operating in the Falklands.

The British government stated that Argentine domestic law does not apply within the Falkland Islands. The UK government stated it sees no legal basis for courts outside Argentina to enforce measures taken against businesses in the Falkland Islands. Britain cites a 2013 referendum in which Falkland Islanders voted to remain a British territory as basis for its position.

Argentina argues that the principle of self-determination does not apply to the Falkland Islands population because it considers them implanted by Britain after 1833. Argentina's claim to the Falkland Islands is enshrined in its constitution.

The Falkland Islands are located approximately 480 kilometers (300 miles) off the coast of Argentina. The Falkland Islands have a long history of being a British territory, with the UK formally administering the islands since 1833, according to the UK Foreign, Commonwealth & Development Office (FCDO).

Why It Matters

The injunction represents an escalation in the long-standing dispute over the Falkland Islands, where Argentina asserts sovereignty based on constitutional claims and historical administration prior to 1833. The legal action targets major international energy operators and invokes domestic laws with severe criminal penalties, signaling Buenos Aires' intent to use judicial mechanisms to challenge offshore development. The ruling also shows the tension between Argentina's sovereignty claims and the self-determination arguments cited by the United Kingdom and the Falkland Islands government.

The case fits a pattern of increasing legal pressure on foreign energy firms operating in the disputed waters, following previous actions against Brazilian, Canadian, and U.S. companies. The outcome may influence international investment in the region and test the limits of extraterritorial enforcement of Argentine law. With commercial production scheduled for 2028, the injunction delays a project that local officials view as essential for economic diversification beyond fishing.

Timeline

On April 2, 1982, the 1982 war between Britain and Argentina lasted 74 days and resulted in the deaths of 649 Argentine and 255 British troops. Three Falkland Islanders were killed in the 1982 war. On September 3, 2026, Argentine President Milei announced measures against companies developing oilfields around the Falkland Islands in a national address on September 3.

What's New

Judge Mariel Borruto, who issued the injunction, has previously ruled on environmental cases in Argentina, including a 2022 decision that halted a lithium mining project in Jujuy Province due to concerns over water contamination, as reported by La Nación.

Rockhopper Exploration, one of the companies targeted by the injunction, has a history of operating in the South Atlantic, including a 2018 agreement with the Falkland Islands government to explore the nearby Alba oil field.