The government on Thursday said it would recognise the sovereignty of Mauritius over the archipelago under a new agreement, which also secures the rights of Britain to operate a military base at Diego Garcia for at least the next 99 years.

The Foreign Office said the status of the base will be undisputed and legally secure following a political agreement between the two countries.

Foreign Secretary David Lammy said the government had “inherited a situation where the long-term, secure operation of the Diego Garcia military base was under threat”.

He added: “Today’s agreement secures this vital military base for the future.

“Our deal, supported by our US partners, will protect international security, close a potential illegal migration route, and avert threats to peace and prosperity in the Indian Ocean.”

Joe Biden welcomed the agreement as a “clear demonstration that through diplomacy and partnership, countries can overcome long-standing historical challenges to reach peaceful and mutually beneficial outcomes”.

The US President said the Diego Garcia military base plays a “vital role” in US national, regional and global security and the deal secures its operation for a century.

But Tory leadership hopefuls reacted furiously, with Robert Jenrick saying: “It’s taken three months for (Sir Keir) Starmer to surrender Britain’s strategic interests.

“This is a dangerous capitulation that will hand our territory to an ally of Beijing.”

Meanwhile James Cleverly, a former foreign secretary, said: “Weak, weak, weak! Labour lied to get into office. Said they’d be whiter than white, said they wouldn’t put up taxes, said they’d stand up to the EU, said that they be patriotic. All lies!”

Fellow Tory leadership candidate Tom Tugendhat said: “This is a shameful retreat undermining our security and leaving our allies exposed.”

Negotiations have been going on for two years, kicking off under Mr Cleverly as foreign secretary, and the majority of talks were held under the Conservative government.

 BBC