Argentine President Javier Milei intensified his country's long-standing dispute with Britain over the Falkland Islands on Thursday, announcing new measures to block an oil project near the archipelago and citing remarks by U.S. presidential candidate Donald Trump as evidence of potential U.S. support.

Milei framed Trump's comments as a direct benefit of his relationship with the former U.S. president, a connection that has drawn criticism from some of his political opponents for being overly deferential.

"The United States is considering this change in position because it knows that Argentina has a reliable partner, aligned with Western values, in a strategically important position that can be a valuable ally in the decades to come," Milei stated in a national television address.

The Argentine leader unveiled actions intended to halt the development of the Sea Lion deep-sea oil project, located approximately 220 kilometers (140 miles) north of the islands. British company Rockhopper Exploration and Israel's Navitas Petroleum are planning to commence drilling in the coming months, with oil production anticipated to start in 2028. Argentina asserts that this project constitutes an illegal exploitation of resources within waters it claims as its own.

Milei threatened increased sanctions against companies involved in the offshore drilling and announced additional funding for a naval base in Argentina's southernmost province of Tierra del Fuego. This move aims to bolster Argentina's military presence near the islands, which are known in Argentina as the Malvinas.

"Argentina will not stand idly by," Milei declared. "Any further advance on the Malvinas Islands will be considered a violation of our national security."

This renewed focus on the Falklands marks a significant shift for Milei, who has faced domestic criticism for strengthening ties with Britain and expressing admiration for Margaret Thatcher, the British prime minister during the 1982 Falklands War. The conflict resulted in the deaths of 649 Argentine soldiers, 255 British service members, and three islanders, and remains a sensitive issue in Argentina more than four decades later.

The sovereignty claim over the islands is enshrined in Argentina's constitution and is a frequent expression of national identity. For Milei, facing declining approval ratings and economic challenges ahead of next year's election, the Falklands issue presents a unifying political opportunity.

"We can argue about my style. We can disagree over fiscal or exchange-rate policy," Milei said. "But there are causes that rise above any political difference. The Malvinas is one of them."

Some political figures expressed skepticism. Nicolás del Caño, a leftist opposition lawmaker, suggested Milei might be leveraging the sovereignty claim to bolster his electoral prospects and serve U.S. interests.

Argentina's claim to sovereignty is based on its assertion that it inherited the islands from Spain, its former colonial ruler, and that Britain has occupied them illegally since 1833. Britain contests this, emphasizing the islanders' preference to remain a British overseas territory.

Historically, U.S. administrations have maintained a neutral stance on the competing sovereignty claims while acknowledging Britain's administration of the islands. A departure from this position would represent a significant diplomatic development and could heighten trans-Atlantic tensions.

Earlier in the week, Trump had indicated that his administration might review the U.S. stance on the Falklands dispute, stating, "I always review every position."

In a separate interview, Trump declined to directly address whether the U.S. would assist Britain in a potential Falklands conflict, instead reiterating past criticisms regarding Britain's support for U.S.-led military operations.

An internal Pentagon email that surfaced in April suggested the possibility of Washington reconsidering its position on the Falklands as a potential means to influence NATO allies' actions regarding Iran.

Downing Street has affirmed that Britain will not cede sovereignty over the Falklands. A spokesperson for British Prime Minister Rishi Sunak stated that sovereignty rests with the U.K. and that the islanders' right to self-determination is paramount, referencing a 2013 referendum where islanders overwhelmingly voted to remain a British territory.

Milei's increased focus on the Falklands comes as plans for significant oil production in the region raise the economic stakes. He warned that the Sea Lion project could lead to a broader oil boom, benefiting the islands with resources Argentina claims and further solidifying British presence.

He pledged to expedite sanctions against companies involved in the oil projects, extending penalties to suppliers, shareholders, and directors. Proposed legislation could also prevent companies associated with these projects from operating or securing contracts within Argentina.

Milei also committed additional funds to construct a naval base in Tierra del Fuego and enhance telecommunications capabilities in the region to strengthen Argentina's South Atlantic presence, stating, "A poor country without armed forces can hardly make effective progress on its sovereignty claims."