Argentina is taking its fight over offshore oil in the Falkland Islands (Malvinas) into the criminal courts, adding a sharper legal edge to a sovereignty dispute that has been pursued for decades through diplomacy.
Foreign Minister Pablo Quirno is set to present a criminal complaint against Navitas Petroleum Development & Production, Navitas Petroleum Atlantic United, Navitas Petroleum LP, JHI Associates and Eco (Atlantic) Oil & Gas. Argentina says the complaint can also encompass directors, managers, representatives and other people it believes participated in the conduct under investigation.
Buenos Aires says several of the companies hold licenses granted by the United Kingdom for hydrocarbon exploration or exploitation in the Malvinas North Basin. Argentina argues that those licenses violate Law 26.659, which restricts hydrocarbon activity in areas Buenos Aires considers subject to its sovereignty claim.
The legal argument is inseparable from the Sea Lion oil project north of the islands. Rockhopper Exploration and Navitas Petroleum are developing the project, and its potential scale has made offshore hydrocarbons the most consequential economic issue in the sovereignty dispute. If production goes ahead, control of the surrounding resources will have an economic reality that is difficult for either side to treat as merely symbolic.
Argentina has already opened administrative sanctions proceedings against 45 individuals and companies linked by the government to unauthorized hydrocarbon activity. Monday's criminal complaint is aimed more directly at companies at the center of the oil project.
Milei is also connecting the sovereignty campaign to Argentina's military and maritime infrastructure. He has instructed Economy Minister Luis Caputo to prioritize the Integrated Naval Base in Ushuaia, along with other strategic projects, when preparing the 2027 national budget. The budget is due to reach Congress on September 15.
For Ushuaia, the decision has a significance that goes beyond the dispute itself. The city is one of Argentina's principal gateways to Antarctica and a base for naval activity in the far south. A more capable naval and logistics complex could support maritime surveillance, Antarctic operations and other state activity in waters that are increasingly important to fishing, shipping and energy policy.
The timing is deliberate. Milei has put the Malvinas at the center of his foreign-policy message since his September 3 national address, while President Donald Trump's recent remarks have raised questions about whether Washington's traditional approach to the sovereignty dispute could change. There has been no formal U.S. policy reversal.
Britain continues to administer the islands and rejects Argentina's sovereignty claim. The British government also maintains that the islanders have the right to determine their political future, while Argentina insists that the dispute should be resolved through negotiations between the two states.
For the companies involved, the dispute now has a concrete Argentine legal consequence. A company can be operating under licenses it considers valid in the Falkland Islands (Malvinas) and still face proceedings in Argentina based on a completely different assertion of territorial authority. That conflict is likely to become harder to ignore as the oil project advances.
Nothing announced Monday represents a military move against the islands. The government's strategy is being carried out through criminal law, administrative enforcement, legislation, diplomacy and investment in southern infrastructure. Each measure reinforces the others.
The immediate milestones are already set. Quirno is to present the criminal complaint, the government is preparing the 2027 budget, and Congress is expected to receive the sovereignty legislation and budget proposals in the coming days. The legal fight over Sea Lion is therefore moving into a phase in which court proceedings and investment decisions will develop alongside the political dispute.
Source: Office of the President of Argentina, Official Communique No. 160, September 7, 2026; Official Communique No. 158, September 4, 2026.