Argentina has increased pressure on the United Kingdom over the disputed Falkland Islands after President Javier Milei threatened economic sanctions against companies involved in oil exploration near the islands. Milei said Argentina could not allow foreign companies to develop oil resources in waters around the Falklands, which Argentina calls Las Malvinas. He argued that the islands are historically and legally part of Argentina and said the current situation could create a serious problem for his country. The main issue is the Sea Lion oilfield, located about 130 miles from the Falkland Islands. The field is believed to contain around 1.7 billion barrels of oil, making it an important potential energy resource. Two companies, Britain's Rockhopper Exploration and Israel's Navitas Petroleum, are planning to develop the oilfield. Work is expected to move forward over the next few years. Milei warned that Argentina must act before the companies gain the ability to extract the oil. Milei said his government plans to introduce legislation that could impose sanctions on energy companies involved in what Argentina considers unauthorized activities around the Falklands. Argentina already has laws that allow restrictions on companies involved in oil projects that Buenos Aires considers illegal. The UK has strongly rejected Argentina's position. The British government said the Falkland Islanders have the right to determine their own future and that this right includes the ability to develop their natural resources. Britain also reaffirmed that the Falkland Islands will remain a British Overseas Territory for as long as the islanders want. The dispute is not new. Argentina and the UK have argued over sovereignty of the islands for decades. In 1982, Argentine forces invaded the Falklands, leading to a 74-day war with Britain. The conflict ended with British forces retaking the islands. Hundreds of people were killed during the war, including 255 British military personnel and 649 Argentine military personnel. Three Falkland Islanders also died. Since then, Argentina has continued to claim sovereignty over the islands, while Britain has maintained control and supports the islanders' right to choose their political future. The islanders have also strongly supported remaining British. In a 2013 referendum, 99.8% of voters chose to remain a British Overseas Territory, with only three people voting against. The latest dispute is particularly important because of the large amount of oil believed to be beneath the waters around the islands. For Argentina, the issue is also connected to domestic politics. Milei's popularity has fallen, and he faces political challenges ahead of the next presidential election. Taking a stronger position on the Falklands could help him appeal to Argentine voters who see the islands as an important part of the country's national identity. Milei also announced plans for a new naval base in Tierra del Fuego, in southern Argentina. He presented the move as part of Argentina's broader effort to strengthen its position in the region. Another important factor is the United States. US President Donald Trump recently suggested that Washington's position on the Falklands could be reviewed. When asked whether the US would support Britain during a possible dispute, Trump pointed to Britain's lack of support for the United States during its war with Iran. Milei believes changes in the US position could create a better opportunity for Argentina to push its claim. He described Argentina as a reliable US partner and said there were now "winds of change" supporting Argentina's position. Britain, however, remains firm. UK officials say their commitment to the Falkland Islands is "absolute and unshakeable." The dispute is therefore becoming more complicated because it now involves territorial claims, oil resources, domestic politics and changing relations between Argentina, Britain and the United States. For now, there is no indication of a new military conflict. However, Milei's threat of sanctions and the planned development of the Sea Lion oilfield could create further diplomatic tensions between Argentina and the UK in the coming months.