Rishi Sunak's spokesman has said there is "no doubt" the Falkland Islands are British after Argentina's new president said it was time to "get them back".
Javier Milei, elected as Argentina's president on Sunday, said Buenos Aires had "non-negotiable sovereignty" over the islands.
And he vowed to get the islands back through "diplomatic channels".
But the UK prime minister's spokesman said the issue of sovereignty "was settled decisively some time ago".
