On 23 March 1946, Argentina's National Commission of the Antarctic established new boundaries for Argentine Antarctica between 25° and 74° West longitude (the far eastern side of South Sandwich Islands). Chile and Great Britain also laid claim to some of the region.

Antarctica has large reserves of coal, iron ore, copper, zinc, nickel, lead as well as oil and gas, estimated at 200 billion barrels – more than the UAE or Kuwait. Moreover, in the past century, new reasons have emerged for the appropriation of this land: the deployment of military missile and naval bases, nuclear power facilities, and sites for nuclear and toxic waste.

Since 1917, Great Britain, Australia, France, Chile, and Argentina have unilaterally declared parts of Antarctica their own. The only reason a territorial conflict did not break out in Antarctica was because of World War II.

On 1 December 1959, the 12 countries concerned signed the Antarctic Treaty, "freezing" the situation. These countries also promised not to test nuclear weapons or bury radioactive waste on the mainland, and to conserve the region's bioresources. Before the treaty was signed, Argentina, Australia, Chile, Great Britain, New Zealand, France, and Norway had territorial claims. Peru, the Soviet Union/Russia, the US, and South Africa reserved the right to make claims. The treaty expires in 2048 and a new round of tensions around Antarctica can probably be expected.

Argentina still claims to be a bi-continental country. The Anglo-Argentine conflict over the Falkland Islands (Malvinas) in 1982 had Antarctic overtones. On 23 September 2020, the Argentine Congress would restate Argentina's ownership of the Antarctic territories. Chile and the UK saw this as an attempt at aggression.

Source:

Evgeny M. Astakhov. The Argentine Projection of “Russian Peace,” “Ibero-American notebooks,” No. 3(5), 2014.