Milei prepares legal escalation over Malvinas oil project

What legal action is Argentina preparing to take against the Sea Lion oil project, and what would it ask the maritime tribunal to do?

Argentina is preparing legal action against the Sea Lion oil project because it considers the development an unlawful exploitation of resources in waters near the disputed Malvinas Islands. It has already started arbitration against Britain under the UN Convention on the Law of the Sea, known as UNCLOS or CONVEMAR.

Argentina plans to ask the International Tribunal for the Law of the Sea, based in Hamburg, to impose provisional measures. These would be temporary steps intended to address the project while the wider arbitration continues. The tribunal would examine issues under maritime law, not decide sovereignty over the islands.

The request is expected after Britain lets Argentina’s two-week deadline expire without stopping the project. If granted, the measures would be obligatory for the states involved. Navitas and Rockhopper still plan to begin production in 2028 after drilling starts early next year.

What are the Sea Lion project and the International Tribunal for the Law of the Sea?

Sea Lion is an offshore oil project in the North Malvinas Basin, about 220 kilometres north of the islands. Israel’s Navitas Petroleum and Britain’s Rockhopper Exploration plan to develop the field. They intend to begin drilling early next year and start producing oil in 2028.

The International Tribunal for the Law of the Sea, or ITLOS, is based in Hamburg. It handles disputes and legal issues governed by the UN Convention on the Law of the Sea. In this case, Argentina wants it to consider temporary measures connected with the planned exploitation of oil.

ITLOS would not determine whether Argentina or Britain owns the Malvinas. Instead, it could examine whether unilateral resource exploitation is allowed in a maritime zone where sovereignty is disputed. Any provisional measures it grants would be obligatory for the states involved while arbitration continues.

How large could Sea Lion’s oil production become, and how much oil do Navitas Petroleum and Rockhopper Exploration each own?

Sea Lion is planned as a large offshore oil development. Its first stage aims to produce up to 55,000 barrels per day. Later, the project could raise capacity to 125,000 barrels per day, making its proposed expansion substantial.

Navitas Petroleum holds the larger share, with a 65 percent stake in Sea Lion. Rockhopper Exploration owns the remaining 35 percent. The companies plan to start drilling early next year and begin producing oil in 2028. Rockhopper executive director Samuel Moody described the project as entering a decisive period.

Those production targets remain plans rather than current output. The project faces legal and political opposition from Argentina, which calls the exploitation illegal. Pressure has also affected suppliers, with some oil-services companies withdrawing because of possible sanctions. The dispute has contributed to falling share prices for both companies, according to Argentina’s foreign minister.

Why do Argentina and the United Kingdom disagree over who has the right to license oil exploration near the Malvinas/Falkland Islands?

Argentina and the United Kingdom disagree because they claim different rights over the Malvinas Islands and surrounding maritime resources. Argentina claims the islands, while Britain has controlled them since 1833. In the United Kingdom, they are known as the Falkland Islands.

The Sea Lion licences were granted by the Falkland Islands Government. Rockhopper says those licences are valid and that its operations are lawful. Argentina rejects that position. It says companies must choose between operating illegally in a disputed territory or working profitably and safely in Argentina.

The disagreement is therefore about more than oil production. It concerns whether Britain and the Falkland Islands Government can authorise extraction in waters whose sovereignty Argentina disputes. Britain backs development of the islands’ natural resources, while Argentina calls the project unlawful exploitation of non-renewable resources.

What could happen to the oil project and the companies involved if Argentina obtains provisional measures or penalizes suppliers?

If ITLOS grants provisional measures, the decisions would be obligatory for the states involved. The project could face restrictions while the wider arbitration proceeds. That could disrupt the companies’ plans to drill early next year and begin oil production in 2028.

Argentina is also threatening companies involved in what it considers illegal exploitation. Supplier withdrawals show how that pressure can work in practice. US oil-services giant Halliburton is among the providers that have pulled out amid the threat of sanctions. Fewer suppliers could complicate work needed to advance the field.

The dispute has already affected the project’s business environment. Argentina’s foreign minister pointed to supplier withdrawals and falling share prices for Rockhopper and Navitas. Britain rejects Argentina’s position, and the companies maintain that their licences are valid. The ultimate effect will depend on tribunal decisions, arbitration, and how firms respond to Argentine penalties.

How is an Annex VII arbitration under UNCLOS different from provisional measures imposed by ITLOS?

Annex VII arbitration is the wider dispute-resolution process Argentina has begun under UNCLOS. It is intended to examine the substantive disagreement over Britain’s unilateral oil activities. This process considers the legal claims and evidence, rather than simply providing an immediate pause.

Provisional measures from ITLOS serve a different purpose. Argentina wants the Hamburg tribunal to impose temporary requirements while the Annex VII arbitration unfolds. Such measures can address urgent risks before the final dispute is resolved. If granted, they would be obligatory for the states involved.

The two procedures are connected but not identical. Arbitration is the main legal examination, while provisional measures are interim steps. Neither process, as described in the article, would decide sovereignty over the Malvinas. ITLOS would instead rule on questions specifically linked to the Law of the Sea, including resource exploitation in disputed maritime areas.

What are maritime zones under the law of the sea, and why does sovereignty over territory affect the right to exploit non-renewable resources such as offshore oil?

Maritime zones are areas of ocean measured from a country’s coast, with different legal rights attached to each area. The law of the sea governs activities such as navigation, resource use, and environmental responsibilities. The article focuses on whether oil can be extracted in a maritime zone whose sovereignty is disputed.

Sovereignty matters because the state with lawful authority over territory generally claims the related power to license resources around it. Britain supports development of the islands’ natural resources, and the Falkland Islands Government granted the Sea Lion licences. Argentina says those activities unlawfully exploit resources in waters linked to territory it claims.

ITLOS could examine this legal question under UNCLOS, but it would not settle ownership of the Malvinas. Argentina is seeking temporary measures while Annex VII arbitration proceeds. The outcome could affect whether unilateral offshore oil development can continue in disputed maritime areas.

Key Facts:

📌 Argentina has initiated arbitration against Britain under UNCLOS.

📌 It plans to seek provisional measures from ITLOS in Hamburg.

📌 The tribunal would not decide sovereignty over the Malvinas.

📌 Sea Lion lies about 220 kilometres north of the islands.

📌 Navitas and Rockhopper plan to develop the offshore field.

📌 ITLOS is based in Hamburg and applies Law of the Sea rules.

📌 First-stage production could reach 55,000 barrels per day.