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“Keir Starmer has secured his legacy,” said The Daily Telegraph: his “shameful surrender of the Chagos Islands will go down as this nation’s foreign policy nadir”.

Last week, the PM signed a long-dreaded treaty that officially hands control of the Indian Ocean archipelago to Mauritius – effectively ceding a strategically vital territory that sits in an area of interest for China. To add insult to injury, once the treaty is ratified by MPs, we will pay Mauritius £101 million a year for the next 99 years to rent back a key UK-US military base on the largest island, Diego Garcia.

“This lousy deal essentially amounts to a massive gift from British taxpayers to the Mauritian government,” said Andrew Tettenborn in The Spectator. So why sign it? The answer, I’m afraid, “is legalism”: the UN’s top court had issued a non-binding ruling calling on the UK to give up control of Chagos – and the PM, ever the lawyer, eagerly bowed to international law. Perhaps he was hoping to set a “shining example” to other countries; instead, they will “regard us with contempt for being a pushover”.

The deal looks “odd” on the face of it, said James Landale on BBC News. But there were plenty of “practical” reasons to sign the treaty. Multiple UN bodies have ruled that the islands belong to Mauritius; had the UK continued to ignore those rulings, the operation of the base could have become “unworkable”. Diego Garcia’s satellite communications would have been threatened because the UK relies on a UN agency in Geneva to maintain access to a particular electromagnetic spectrum; aircraft might not be able to fly in or out, for fear of breaching international law.

As for national security, said Sean O’Grady in The Independent, without this deal, Mauritius could have lawfully granted China permission to establish a military base on another of the islands, sparking a serious crisis. The deal specifically forbids it.

This is all true in theory, said John Rentoul in the same paper. But in reality, Mauritius’ claim to the islands was “weak” – Chagos has never been part of its territory – and UN courts have “no powers of enforcement”. The base wasn’t threatened in any meaningful way.

And yet Starmer’s government doubled down on a deal that will outrage the British public, given the nation’s dire finances. I suspect the biggest driver of this decision was “postcolonial guilt”, said Matthew Syed in The Sunday Times – that sense that, as a nation, we must self-flagellate to atone for the sins of the empire. But Starmer’s conscience-cleansing comes at “extravagant expense” – and will help “no one but our rivals”.