Why an Argentine Court Order Against Falklands Oil Drilling May Not Bite

Argentina and Britain have disputed the Falkland Islands since 1833, and an offshore oil project now turns that quarrel into commercial risk. This week an Argentine judge ordered the project’s British and Israeli operators to stop work in waters Argentina does not control.

Mariel Borruto, a federal judge in Argentina’s southernmost province, issued a preliminary injunction against the Sea Lion oil project this week. Its operators, Israel’s Navitas Petroleum and Britain’s Rockhopper Exploration, say their licences are valid and their timetable stands.

Why This Matters Beyond Argentina

The Falkland Islands, which Argentina calls the Malvinas, lie in the South Atlantic and are administered by Britain. Britain has held them since 1833, and Argentina has never accepted its claim.

Argentina invaded in April 1982, and the 74-day war ended with an Argentine surrender on 14 June. It killed 649 Argentine and 255 British military personnel, along with three islanders.

In a 2013 referendum, 99.8% of islanders who voted chose to remain a British overseas territory. Argentina’s constitution calls its sovereignty over the islands “legitimate and imprescriptible”, meaning the claim cannot lapse.

Sea Lion lies about 220 kilometres (137 miles) north of the islands, in the North Falkland Basin. Navitas operates it with a 65% stake, while Rockhopper, listed in London, holds the remaining 35%.

The partners took a final investment decision in December 2025, for a first phase of about US$1.8 billion. That phase aims for peak output of about 50,000 barrels a day, from 319 million barrels of certified resources.

Drilling is scheduled to begin in early 2027, with first oil expected in 2028. For investors, the question is whether Argentine legal pressure can raise costs or scare off partners.

What the Order Actually Says

The case was heard in Rio Grande, a city in Tierra del Fuego, Argentina’s southernmost province. The injunction tells Navitas and Rockhopper to refrain from starting or continuing work on the project, Anadolu Agency reported.

It suspends drilling, subsea installation and the start of commercial production. It holds until an environmental impact assessment has been carried out by Argentine authorities.

It also orders disclosure of schedules, well locations, contractors, financiers and insurers. The court described the measure as provisional, and it is not a finding of liability against anyone.

Borruto had asked the federal prosecutor to advise on whether she had jurisdiction at all. That question has not been resolved, and it decides whether any of this bites.

Who Asked For It, and Why

The claim was brought by CECIM La Plata, a centre for veterans of the 1982 war. It was joined by the Argentine Association of Environmental Lawyers.

Their three grounds were environmental, sovereign and procedural. The environmental argument is that no impact assessment was carried out for the drilling.

The sovereignty argument rests on a 1976 United Nations resolution barring unilateral changes while the dispute is pending. In the claimants’ view, drilling is such a change, because it exploits resources Argentina considers its own.

Why the Companies Are Not Stopping

Rockhopper is British and Navitas is Israeli, and neither holds meaningful assets in Argentina. In a joint statement they said their petroleum licences were lawfully granted by the Falkland Islands government.

They described that government as a self-governing British overseas territory with continuing support from London. They added that recent developments are not expected to have a material effect on the project or its timetable.

An Argentine court order does not easily reach a company with nothing inside Argentina to seize. Britain rejects Argentina’s sovereignty claim and supports economic activity around the islands, Anadolu Agency noted.

The Last Time This Was Tried

In June 2015 a federal judge in Tierra del Fuego ordered the seizure of about US$156 million. The targets were Premier Oil, Falkland Oil and Gas, Rockhopper, Noble Energy and Edison.

Nothing was collected, and the companies held no meaningful assets in the country. Britain’s foreign office answered that Argentine law does not apply and is not enforceable in the islands.

Eleven years on, the legal architecture has not changed, and neither has the enforcement problem. Rockhopper, one of the 2015 targets, is now a partner in the project facing the new order.

How This Fits the Wider Escalation

The pressure began earlier in September, when President Javier Milei announced tougher sanctions on firms working there without Argentine authorisation. According to MercoPress, his decree bars such firms, their shareholders, directors and suppliers from operating in Argentina.

Shares in both operators fell on 4 September, as that dispute intensified. Rockhopper dropped about 6.5% that day, closing at 72.9 pence in London, and Navitas about 2.3% in Tel Aviv.

Those are movements on political risk, not on any change to the fields or the engineering. The injunction then arrived in the same week the government sent a sovereignty bill to Congress.

That bill would raise penalties for exploiting resources around the islands to twenty years in prison. It would also allow the dissolution of companies that take part.

The instruments point the same way, and none of them directly reaches a British-licensed operator in island waters. What they do reach is any company with Argentine assets that might want to supply the project.

How the Licensing Works, If You Have Not Followed It

The islands run their own hydrocarbons licensing regime, issued by the Falkland Islands government. Britain treats that government as self-governing, and supports the licences it grants.

Argentina does not recognise any of it, and legislates as though the resources were Argentine. Both systems claim to govern the same seabed, and neither recognises the other’s paperwork.

A company drilling there is legal under one set of rules and criminal under the other. That is not a loophole but the sovereignty dispute expressed as commercial law.

What It Means If You Follow the Companies or the Region

For shareholders, the practical question is whether financiers, insurers or contractors get nervous. That is the real exposure, and it is why the disclosure part of the order matters more than the suspension.

A supplier with operations in Argentina now has a reason to think twice. For the project itself, nothing has been reported as stopping, and the operators say the schedule holds.

For Argentina, the case keeps the sovereignty claim in court and in the headlines at little cost. The date to watch is the start of drilling in early 2027, not the injunction.

What Is Not Yet Known

Whether the court has jurisdiction has not been settled, and the prosecutor’s advice has not been published. Whether the operators will appear in the Argentine proceedings at all is unreported.

Britain’s formal response to the injunction had not been issued when this article was published. No contractor or insurer has said publicly whether it will change its position.

Frequently Asked Questions

Sources: Anadolu Agency, the court ordering a halt, Buenos Aires Herald, the veterans’ claim, MercoPress, the operators defending the timetable, MercoPress, the 2015 seizure order, Infobae, the sovereignty bill sent to Congress, World Oil, the Sea Lion investment decision, Infoleg, Argentina’s constitution and its Malvinas clause, Wikipedia, the 1982 Falklands War, Wikipedia, the 2013 Falklands referendum