The US forced Britain to allow the sale of F-16 fighter jets to Argentina, it has been reported, amid fears over the security of the Falkland Islands. 

The Biden administration agreed the deal with Argentina in 2024 - before Labour got into power. 

Britain imposed a ban on exporting arms to the South American country during the Falklands War in 1982. 

However Argentinian president Javier Milei said in December last year that talks had begun on changing these restrictions.

In the same month, just a few days later, Argentina took delivery of the $35million (£25.9million) per unit fighter jets, which Mr Milei described as 'guardian angels'. 

Despite the ban imposed by Britain more than 40 years ago, it is now understood the US forced the UK to allow the sale. 

It has been reported that Foreign Office officials were told 'in no uncertain terms' not to oppose the deal. 

One Argentine source said the US had made a 'strong' case for the sale in secret talks with Britain, while other sources said the UK had been pressured into allowing the US to sell the Mach 2.05 fighter jets. 

The revelations come as fears grow over the future of the Falkland Islands after President Trump this week hinted that he would help Argentina's claim over the archipelago.  

The move appears to be part of his drive to punish Nato countries for not helping him wage war on Iran. 

The islands, which have a population of around 3,500 people, have been under British rule since 1833. 

However they were invaded by military dictator Galtieri Castelli in April 1982 before then-prime minister Margaret Thatcher sanctioned British forces to reclaim the islands, defeating Argentina after two months of conflict in June the same year. 

The war claimed the lives of 649 Argentinians, 255 Britons and three civilians killed by shelling. 

In March 2013 the Falklands held a referendum over whether to retain their current political status as a British Overseas Territory, where 99.8 per cent of people voted 'Yes' to British rule. 

However Argentina has continued to lay claim to the islands since its defeat in 1982, including since the decisive referendum 13 years ago. 

Mr Milei, a close ally of Mr Trump, has again reiterated the country's claim to the islands - but the threat has drawn outrage from across the UK's political spectrum. 

Downing Street insisted the status of the Falklands 'could not be clearer', while Kemi Badenoch branded the suggestion 'nonsense' and the Lib Dems called for King Charles's trip to the US next week to be called off. 

Reports suggest the Pentagon will look again at Britain's claim to the territory.

According to Reuters, an internal memo floated reassessing US diplomatic support for longstanding European 'imperial possessions' such as the Falklands, as well as kicking Spain out of Nato for refusing to ramp up defence spending.

British veterans of the 1982 conflict have criticised Mr Trump for his comments over the future of the South Atlantic archipelago, accusing him of being a 'bully'. 

Welsh Guardsman Simon Weston, who suffered severe burn injuries after the Sir Galahad landing ship was set on fire by Argentinian fighter jets, said the US President was a 'schoolyard bully' and warned that Argentina could use the policy shift to justify another invasion. 

Mr Trump's comments came after he previously described Sir Keir Starmer as 'no Winston Churchill' as Britain initially did not grant a request from the US to allow its aircraft to attack Iran from two British bases.

The UK later ​agreed to allow defensive missions aimed at protecting residents of the region, including British citizens, amid Iranian retaliation.  

Mr Trump also insulted the Royal Navy, referring to its aircraft carriers as 'toys'.