What’s the Falklands oil project at the heart of latest UK-Argentina spat?

The United Kingdom has pledged to defend its interests in the Sea Lion project to develop an oilfield near the Falkland Islands, as Argentina has brought a legal challenge before a tribunal over the offshore oil exploration, citing environmental concerns. Attorney General Ellie Reeves, representing the UK government at the International Tribunal for the Law of the Sea (ITLOS), said billions of pounds that are crucial to the future of the Falkland Islands will be lost if Argentina is successful in getting the project blocked. The Hamburg-based tribunal is sitting for two days as Argentina seeks a provisional ruling to suspend oil drilling.

Reeves also said Argentina’s objection to the development was rooted in its territorial claims. The UK prime minister’s official spokesman said that the hearing is not about the sovereignty of the Falklands, echoing his country’s position that the island’s sovereignty is not up for negotiation. The Sea Lion development is a UK-Israeli venture to drill for oil in waters administered by the Falklands. The UK’s Rockhopper Exploration and Israel’s Navitas Petroleum, operator of the Sea Lion oilfield, located about 220km from the islands, are expected to start the project in March 2027, with oil production to begin in 2028. According to Rockhopper Exploration, the Sea Lion exploration field holds an estimated 1.7 billion barrels of oil in place, of which 500 million barrels are recoverable resources.

Argentina’s President Javier Milei announced measures to block the development in September and said in a post on X that he had instructed the Foreign Ministry and the country’s legal teams to initiate arbitration proceedings against the UK. Argentina formally filed a complaint at the tribunal seeking provisional measures against the UK on October 13. The UK has administered the Falkland Islands since 1833, but Buenos Aires claims sovereignty over what it calls Las Malvinas. Milei has also threatened tougher sanctions on companies involved in the oil exploration project, preventing them from operating in Argentina’s oil and mining sectors.

During the hearing, Argentina’s lawyer, Mario Oyarzabal, argued that action was needed to block the project. According to The Guardian, Oyarzabal stated that Argentina respects the interests of the inhabitants of the islands and their way of life, but added that the British citizens do not have a right to decide to which state the islands belong. He also stated that these resources belong to the Argentine people, including 46 million of them, along with the 1,247 inhabitants born on the islands. In response, Reeves told the Law of the Sea Tribunal that Argentina wanted to take control of those resources for itself, noting that the provisional measures sought would have devastating consequences for the Falklands people and their right to self-determination.