Falklands Oil: Argentina Gives the UK Two Weeks, Then Plans a Law of the Sea Case
POLITICS · ARGENTINA
Key Facts
- —The country Argentina claims the British-run Falkland Islands, which it calls the Malvinas. The two countries fought a 74-day war over them in 1982.
- —What happened On 28 September 2026 President Javier Milei’s office gave Britain two weeks to stop the Sea Lion oil project and opened arbitration under the UN sea treaty.
- —Who is involved Sea Lion belongs to Britain’s Rockhopper Exploration and Israel’s Navitas Petroleum and holds an estimated 1.7 billion barrels (BBC, 29 September). Thales UK is accused over a flight.
- —What it means for you Nothing changes for travel or trade today. Firms active in island oil risk exclusion from Argentine projects such as Vaca Muerta, the foreign minister said on 28 September.
- —Still open London had not publicly answered the deadline by the morning of 29 September. A tribunal ruling would take weeks; in a 2012 Argentine case it took one month.
The Falklands oil dispute moved into international law on Monday. Argentina gave Britain two weeks to halt the Sea Lion project, or it will ask a UN sea tribunal for emergency measures.
The statement from the Office of the President also targeted a British company over a flight to Chile. It follows Britain’s rejection of earlier charges, covered in UK Says It Can Defend the Falklands as Argentina Oil Standoff Hardens.
What Argentina Announced
To contest Falklands oil work, Milei ordered arbitration under Annex VII of the UN Convention on the Law of the Sea. The aim is to stop Sea Lion and any new licences on what Argentina calls its continental shelf.
Argentina also formally demanded that Britain halt oil work within two weeks, which runs to around 12 October. If London does not comply, Argentina will ask the International Tribunal for the Law of the Sea in Hamburg for provisional measures.
Foreign Minister Pablo Quirno said Britain had been notified the same day. “It is about the plundering of our resources,” he told the channel A24, “not an environmental problem.”
Why the Deadline Is Two Weeks
Argentina chose the Hamburg tribunal for sea disputes, while Britain chose the International Court of Justice, TN explained. When choices differ, the treaty sends the case to an arbitral panel under Annex VII.
Such a panel takes months to form. If the two sides cannot agree within two weeks on a court to hear a request for interim relief, the Hamburg tribunal may act first, provided the matter is urgent.
Argentina has used this route before. In 2012 it asked the tribunal to free the frigate ARA Libertad, held in Ghana. A unanimous order came one month later.
The Limits of the Case
The sea treaty covers maritime zones, not who owns land. In 2015 a similar panel declined, by three votes to two, to rule on Mauritius’s claim to the Chagos Islands.
That panel still found Britain had breached the treaty over a marine reserve. Argentina appears to follow that path, targeting unilateral extraction rather than sovereignty itself.
Rockhopper and Navitas have said Sea Lion holds valid licences from the islands’ government. On 21 September the islands’ government said it would extend those licences by five years.
The Flight to Punta Arenas
The statement accused Thales UK Limited of flying a UK-registered aircraft between the islands and Punta Arenas, Chile, without Argentine permission. Milei ordered sanctions proceedings, criminal complaints and diplomatic steps.
Clarín reported two versions: a September flight for the Royal Air Force, or transport for a business forum. Infobae said the aircraft carried members of the islands’ delegation.
The forum runs on 28 and 29 September with about 40 island business representatives and 30 to 40 Chilean firms, Infobae reported. A new sea link to Stanley is planned for mid-November, according to organisers cited by El Destape.
Quirno kept the tone calm towards Santiago. He called Chile’s support “very clear” and said the two were “brother countries”, after Chile’s defence minister weighed in last week.
What Is Not Yet Known
Britain had not publicly responded to the deadline by Tuesday morning. It is also unclear whether Thales UK will contest the flight allegations.
Argentina has not published the arbitration notice itself. Whether Hamburg would find urgency in a project not yet producing Falklands oil is an open legal question.
Sources: Office of the President statement, 28 September 2026, as published by Radio Nacional; Clarín; TN; Perfil; Infobae; The Clinic; El Destape; BBC.
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