The Argentine government announced on September 28, 2026, that it is studying an international arbitration case against the United Kingdom under the United Nations Convention on the Law of the Sea. President Javier Milei instructed the country’s foreign ministry and legal teams to initiate the Annex VII procedure to halt hydrocarbon exploration in the North Malvinas Basin. In the same announcement, the Office of the President reported that British company Thales UK Limited operated an aircraft between the islands and Punta Arenas, Chile, without authorization from Argentine authorities.
Legal Actions Against Offshore Oil Projects in the South Atlantic
The latest announcement follows a sharp increase in administrative and legal measures from Buenos Aires targeting energy firms operating around the islands. Over the past month, the Argentine Foreign Ministry sent roughly 200 warning notes to investors across 30 countries and launched approximately 60 administrative procedures. Furthermore, prosecutors filed at least three criminal complaints in Argentine courts against ten energy companies and their directors, spanning British, Israeli, and Canadian capitals.
These judicial actions explicitly target the Israeli energy firm Navitas, which leads the Sea Lion offshore project located 220 kilometers north of the islands. The project aims to begin crude oil extraction by 2028. The Argentine administration maintains that any resource extraction authorized solely by the local island government is entirely illegal under national law.
Did You Know?
In the weeks preceding the arbitration announcement, Argentina’s foreign ministry deployed nearly 200 warning notes to investors across 30 countries regarding unauthorized hydrocarbon exploration in the platform.
Diplomatic Clashes at the United Nations
The dispute escalated just days prior when President Milei addressed the United Nations, demanding that the United Kingdom resume bilateral negotiations for a peaceful resolution to the sovereignty dispute. During that address, Milei warned of consequences for companies extracting natural resources in the South Atlantic without official permission from Buenos Aires.
The United Kingdom swiftly rejected the warning through an official statement. London characterized the attempts to block local oil development as an unacceptable exercise of extraterritorial jurisdiction lacking any justification in international law. The British government reaffirmed its steadfast support for the right of the island inhabitants to self-determination.
https://x.com/OPRArgentina/status/2104658778108891452
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Sanctions and Penalties for Thales UK Limited
Alongside the maritime arbitration effort, the Argentine government ordered urgent penal complaints and sanction proceedings against Thales UK Limited. The Ministry pointed to detected flights operated by the company along the route connecting the islands and Punta Arenas using a United Kingdom-registered aircraft. Officials stated that these operations proceeded without clearance from national aviation authorities, prompting immediate diplomatic and judicial responses.
Legal challenges against North Malvinas Basin oil exploration
What legal mechanism is Argentina using to stop the oil exploration?
The government is utilizing the Annex VII arbitration procedure outlined in the United Nations Convention on the Law of the Sea to challenge hydrocarbon projects in the North Malvinas Basin.
Which specific energy project is the primary target of these legal actions?
The actions target the Sea Lion offshore project, led by the Israeli oil company Navitas, which sits 220 kilometers north of the islands and targets crude production for 2028.
Why is the Argentine government pursuing Thales UK Limited?
Buenos Aires initiated urgent penal complaints and sanction procedures against the firm after detecting unauthorized flights by a United Kingdom-registered aircraft between the islands and Punta Arenas, Chile.
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