LONDON — The United Kingdom has reached a significant agreement to transfer sovereignty of the Chagos Islands to Mauritius, a decision that simultaneously secures the future of the crucial U.S. military base located on Diego Garcia. This strategic move represents a pivotal development in a long-standing dispute over the islands situated in the Indian Ocean.

Under the terms of the deal, the U.K. will retain leasing rights to Diego Garcia, allowing continued U.S. military operations for a period extending at least 99 years. This arrangement is regarded as vital for both British and American defense strategies.

U.S. Secretary of State Marco Rubio welcomed the agreement, noting that it had received affirmation from President Trump during discussions with British Prime Minister Keir Starmer in February. Starmer emphasized the importance of the deal in bolstering national security, stating it is crucial for Britain’s intelligence operations and defense capabilities.

The Prime Minister of Mauritius, Navin Ramgoolam, celebrated the agreement, labeling it a “historic victory” for the nation and a step toward complete decolonization. The transfer of sovereignty comes amid a backdrop of international legal challenges regarding the islands’ status, with various courts siding with Mauritius on the issue of illegal occupation.

Originally a British territory in 1814, the islands were separated from Mauritius in 1965, mere years before the latter gained independence. This separation paved the way for the U.S. establishment of a military base on Diego Garcia, an action that resulted in the displacement of thousands of Chagossians from their homes.

Despite this new agreement, tensions remain. Although the U.K. allocates funds for the islands, Mauritius asserts that it was coerced into relinquishing control as part of its independence negotiations. International judicial bodies, including a nonbinding ruling from the International Court of Justice in 2019, support Mauritius’ claims, asserting that Britain’s administration of the Chagos Archipelago remains unresolved.

In 2021, a United Nations maritime tribunal rejected Britain’s claims of sovereignty over the islands, further amplifying calls for decolonization. The current agreement officially acknowledges Mauritius as the rightful sovereign over the Chagos Archipelago, further complicating Britain’s historical claim.

Starmer detailed the significance of the military base, underscoring its strategic importance for operations combating terrorism and ensuring the safety of British and American servicemen and women. He confirmed that the deal had garnered support from key allies, including Canada, Australia, and New Zealand, who share intelligence with the U.K.

The decision has elicited mixed reactions from the Chagossian community, with some voicing support while others express concern over their rights to return to their ancestral homes. Political representatives in the U.K., including Labour MP Peter Lamb, have criticized the agreement, questioning its moral implications and advocating for Chagossians’ right to self-determination.

Opposition figures have also weighed in, with Conservative Party leader Kemi Badenoch lamenting the deal as a retreat from British sovereignty. She articulated fears that engaging Mauritius, viewed as a growing ally of China, could undermine U.K. interests.

As this historical transition unfolds, the impacts on both regional stability and the legacy of colonialism are poised to resonate.