Prime Minister Keir Starmer has finalized a pivotal agreement transferring sovereignty of the Chagos Islands to Mauritius. The islands, critical for their naval base on Diego Garcia, saw a temporary legal block before the agreement proceeded.

The agreement would transfer sovereignty of the Chagos Islands from the U.K. to Mauritius — though Britain would retain control of the largest of the chain of islands, Diego Garcia, which hosts ...

British Prime Minister Keir Starmer says he has signed an agreement handing over sovereignty of the Chagos Islands to Mauritius.