Argentina has initiated sanctions proceedings against 45 individuals and companies engaged in oil exploration activities around the Falkland Islands, escalating its pressure over the disputed territory. President Javier Milei's office announced the move on Saturday, following his prior vow of tougher action against firms operating in the British overseas territory.

Argentina asserts its claim over the islands and their surrounding waters, contending that oil extraction requires its authorization. The disputed region holds significant oil reserves, with estimates suggesting the Sea Lion field alone could yield approximately 900 million barrels, potentially generating a £4 billion windfall for the Falkland Islands over 35 years. Production from the Sea Lion field is anticipated to commence in 2028.

In a national address on Friday, President Milei called for a "consensus solution" involving a Hong Kong-style handover of the Falklands to Argentina. He reiterated Argentina's territorial claims and declared his intention to impose sanctions on companies involved in oil projects in the area, characterizing the Sea Lion oilfield as a "clear and present danger" to Argentina's claims.

The United Kingdom has maintained its position, with Foreign Secretary Ed Miliband stating that the Falkland Islands are British and will remain so due to the "overwhelming position of the Islanders." The UK government emphasizes that the islanders' right to self-determination is paramount and will be upheld. Defence Secretary Wes Streeting affirmed the UK's commitment to the Falklands as "absolute and unshakeable."

Downing Street indicated that while the UK aims to strengthen diplomatic ties with Argentina, it does not anticipate a direct diplomatic response to Milei's threats. The UK government supports the Falkland Islanders' right to develop their natural resources for their economic benefit, viewing it as integral to their self-determination.

Argentinian media reported that proceedings could extend to shareholders and service providers for companies involved in the oil projects. The specific entities and individuals targeted by the sanctions have not yet been identified.

President Milei also announced plans to enhance Argentina's defense capabilities with a new naval base in Tierra del Fuego. He noted that the United States is "assessing their historical position in regard to the Falklands."

The renewed tensions follow remarks by U.S. President Donald Trump, who suggested the U.S. might not support the UK in a future conflict over the territory. Downing Street declined to comment on Trump's remarks, stating they were a matter for the U.S. president.

In a 2013 referendum, Falkland Islanders overwhelmingly voted in favor of remaining a British overseas territory, with 99.8% supporting the status quo. The Falklands War in 1982, following Argentina's invasion, resulted in significant casualties on both sides and remains a sensitive historical event. British-based oil exploration company Rockhopper stated it does not expect the Argentinian government's actions to materially affect its project.

President Javier Milei of Argentina addressing the nation.