Argentina moves to extend sanctions against companies linked to Falkland Islands oil projects

Argentina is preparing to broaden its economic and legal pressure on companies involved in hydrocarbon projects around the Falkland Islands (Islas Malvinas), placing investors and suppliers connected to the planned Sea Lion development under increased scrutiny.

President Javier Milei said his government would accelerate the enforcement of existing legislation against companies conducting oil and gas activities in the disputed maritime area without authorisation from Buenos Aires.

The measures announced during a national address include a decree intended to improve coordination between government agencies and speed up sanctions under Law 26,659, which regulates hydrocarbon activity on the continental shelf claimed by Argentina.

The proposed mechanism would strengthen early detection and the exchange of information between the Foreign Ministry, the Energy authorities, the Defence Ministry and other state agencies. Its scope would encompass not only project operators but also their shareholders, directors, contractors and suppliers.

Milei also said his administration would submit a National Sovereignty Defence Bill to Congress. The legislation would increase existing penalties, extend the same restrictions to companies supplying unauthorised projects and prevent sanctioned businesses from entering contracts in Argentina with either the public or private sector.

The proposal would also allow trials in absentia when legally applicable and extend the sanctions framework to activities affecting other natural resources in the islands and surrounding waters.

A second component of the bill would create a National Security Council bringing together foreign policy, defence, intelligence and economic authorities. The body would define a government-wide security strategy and coordinate economic and diplomatic measures against state and non-state actors considered a threat to Argentine interests.

The announcement does not create Argentina’s sanctions policy from the beginning. Legislation adopted in 2011 and strengthened in 2013 already provides administrative and criminal penalties for hydrocarbon exploration, extraction, transport or storage carried out without Argentine permission in maritime areas claimed by the country.

The existing framework allows individuals and companies to be prohibited from operating in Argentina for between five and 20 years. It also provides for the loss of concessions, exclusion from public tenders, suspension of activities and fines linked to the market value of crude oil.

For companies, penalties can reach the equivalent of between 100,000 and one million barrels of WTI crude for unauthorised exploration and between 150,000 and 1.5 million barrels for extraction, transport or storage. Criminal provisions also apply to executives and representatives found to have participated in the conduct.

Argentina has already used the legislation against several companies associated with oil exploration around the islands. Rockhopper Exploration and Navitas Petroleum, the two partners in Sea Lion, are already subject to 20-year restrictions on operating in the Argentine market.

The new policy is therefore aimed primarily at accelerating enforcement and expanding the commercial perimeter around sanctioned projects.

According to Milei, the Argentine Foreign Ministry has sent nearly 180 warning notices to companies and institutions in more than 29 countries. Previous government actions have targeted potential investors, insurers, banks, stock exchanges, brokers, logistics providers and energy-sector associations.

This broader approach could be more significant than sanctions against the project owners themselves. Rockhopper and Navitas have limited direct dependence on Argentina, but some contractors, lenders, insurers and equipment suppliers may have existing operations in the country or want to participate in its expanding oil, gas and mining industries.

Companies connected to Sea Lion could consequently face a choice between working on the disputed project and preserving access to the Argentine market.

At the centre of the dispute is Sea Lion, an offshore oilfield located approximately 220 kilometres north of the islands. The project is operated by Tel Aviv-listed Navitas, which owns a 65% interest, while London-listed Rockhopper holds the remaining 35%.

The partners reached a final investment decision on the first phase in December 2025 and subsequently completed the project’s financing arrangements.

Phase one is expected to require approximately €1.8 billion and is designed to recover 170 million barrels, with peak production of around 50,000 barrels per day. Development drilling is scheduled to begin in early 2027, while first oil remains targeted for the first quarter of 2028.

Rockhopper has reported gross 2C resources of 917 million barrels across the wider field. Navitas is also preparing additional development phases and has acquired a second floating production, storage and offloading vessel for approximately €108 million, with the aim of accelerating production from Sea Lion’s central area later in the decade.

Buenos Aires argues that the project exploits resources located on the Argentine continental shelf and violates United Nations calls to avoid unilateral changes while the sovereignty dispute remains unresolved.

Navitas and Rockhopper reject that position. They maintain that their petroleum licences were lawfully granted by the islands’ government and have the support of the United Kingdom.

The companies said Argentina’s announcement was not expected to have a material effect on Sea Lion’s timetable. Nevertheless, shares in Navitas and Rockhopper fell by as much as approximately 6% and 12%, respectively, following Milei’s address, indicating concern among investors about the potential commercial consequences.

Argentina’s direct ability to stop the development is limited because it does not administer the islands or the project area. Its strategy instead seeks to increase the economic and legal cost for companies participating in the project by restricting their access to Argentine contracts, assets and future business opportunities.

The eventual impact will depend on the final wording of the decree and proposed legislation, how aggressively the rules are enforced and whether suppliers with international operations are prepared to accept the associated risk.

The sovereignty dispute dates back to the 19th century and led to war between Argentina and the United Kingdom in 1982. The islands are administered as a self-governing British Overseas Territory, while Argentina maintains that they, South Georgia, the South Sandwich Islands and the surrounding maritime areas form part of its national territory.

The United Nations recognises the existence of a sovereignty dispute and has repeatedly called on Argentina and the United Kingdom to negotiate a peaceful solution. The two governments remain divided over whether the islanders’ right to self-determination should determine the territory’s status.

UK officials responded to Milei by reaffirming their commitment to the islands and the wishes expressed by residents in the 2013 referendum, when an overwhelming majority voted to retain their status as a British territory.

Milei linked the timing of his initiative to comments from United States President Donald Trump, who suggested that Washington was reviewing its position on the dispute. However, no formal change in US policy had been announced.

The presence of an Israeli company at the centre of the project also creates a diplomatic complication for Milei, whose government maintains close relations with Israel. Argentine Foreign Minister Pablo Quirno said the sanctions would not affect bilateral ties and stressed that Navitas was already restricted from operating in Argentina.

Alongside the corporate measures, Milei announced additional defence funding for the construction of an integrated naval base in Tierra del Fuego and improvements to Argentina’s telecommunications capabilities in the South Atlantic.

For the energy industry, the most immediate question is not whether Argentina can physically prevent Sea Lion from entering production, but how far it can extend the project’s risk beyond its two owners.

If the proposed legislation is approved, the consequences could reach the wider network of financiers, insurers, service companies and contractors required to develop a large offshore oilfield. Sea Lion would then become not only an energy project in disputed waters, but also a test of how effectively Argentina can use access to its own economy as an instrument of foreign policy.