The British government agreed to transfer sovereignty of the Chagos Islands to Mauritius, securing the future of the U.K.-U.S. military base at Diego Garcia. This base, crucial for global security and past military operations, will remain under U.K. control for 99 years, with rent paid to Mauritius. The deal addresses contested sovereignty issues and allows for the potential return of displaced islanders, while strengthening U.K.-Mauritius relations and preventing illegal migration routes.