Argentina Issues Two-Week Ultimatum to UK Over Falklands Oil Exploration

Argentine President Javier Milei has set a two-week deadline for the United Kingdom to halt offshore oil exploration near the Falkland Islands, threatening to escalate the matter to the International Tribunal for the Law of the Sea. Milei announced Monday that Argentina's Foreign Ministry and legal teams are prepared to initiate international arbitration against the U.K. if the Sea Lion project, a venture between British and Israeli companies, is not stopped.

The Sea Lion oilfield is estimated to contain 1.7 billion barrels of oil. Argentina views the exploration project as an "illegal plundering of [Argentina’s] resources." The U.K. Foreign Office, in response, stated that Milei's threats are "another attempt to deny the Falkland Islanders the right to pursue their own economic development and decide their own future," affirming its unwavering support for the islanders' right to self-determination.

The dispute over the Falkland Islands, which Argentina refers to as "Islas Malvinas," has persisted for nearly two centuries. The islands have been a British territory since 1833, but Argentina has never accepted British sovereignty. In a 2013 referendum, Falkland residents voted overwhelmingly in favor of remaining under British rule.

Milei's administration previously announced that Argentina would sanction oil companies operating in the area and strengthen its government's ability to respond to perceived threats against its sovereignty. On September 15, Argentina's Foreign Ministry stated it had sent warning and risk assessment notes to individuals and legal entities in 30 countries and filed criminal complaints against 10 companies and their directors.

Legal experts suggest Milei's two-week ultimatum is linked to a procedural step required before Argentina can seek provisional measures from the International Tribunal for the Law of the Sea. If the U.K. does not comply with Argentina's request within the two-week period, the case will proceed to the tribunal in Hamburg, where both parties would present their arguments before a decision is made on whether the U.K. must cease hydrocarbon resource exploitation.

Argentina has previously utilized international legal mechanisms for maritime disputes, including initiating arbitration against Ghana in 2012 over the detention of an Argentine naval training ship, a case the tribunal ruled in Argentina's favor.

However, experts note that the international court has previously indicated it does not have jurisdiction to rule on territorial sovereignty disputes. Milei's actions also come amid his sharp criticism of the United Nations, which he has accused of inaction regarding escalating tensions with Britain.

United States President Donald Trump has also become involved, suggesting in late August that the U.S. was reviewing its position on the U.K.'s administration of the islands. Trump later referred to the mounting tensions as a "potential disaster" and stated he would "probably be able to settle it out." However, U.S. foreign policy has not substantively changed, according to experts.

Argentina bases its sovereignty claim on a 1965 U.N. Resolution, which calls for bilateral negotiations and consideration of the islanders' interests, while Argentina views the issue as a "colonial situation" where self-determination does not apply. The U.K. maintains that the islanders' right to self-determination, as demonstrated in the 2013 referendum, is paramount. The 1982 invasion of the Falklands by Argentina led to a conflict that Britain ultimately won.