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UK Transfers Sovereignty of Chagos Islands to Mauritius in Landmark Deal

Photo by Simon Dawson / No 10 Downing Street. Licensed under Creative Commons Attribution 2.0.

In a historic move, the United Kingdom has officially agreed to transfer sovereignty of the Chagos Islands to Mauritius. This decision follows a UK High Court ruling that dismissed an injunction attempting to block the agreement, allowing Prime Minister Keir Starmer to finalize the long-disputed deal.


The Chagos Islands were controversially separated from Mauritius in 1965 during the decolonization period, leading to international criticism and legal challenges over the legitimacy of British sovereignty. The 2019 advisory opinion by the International Court of Justice (ICJ) stated that the UK's administration of the islands was unlawful and that sovereignty should be returned to Mauritius.


Strategic Interests Retained

Under the terms of the new agreement, Mauritius gains formal sovereignty over the Chagos Islands. However, the UK and the United States will retain joint operational control of Diego Garcia—a key U.S. military base on the archipelago—for the next 99 years through a lease arrangement. This lease includes an option for a 40-year extension.


The UK will pay Mauritius an average of £101 million per year over the 99-year lease period, amounting to a total of approximately £3.4 billion. Additionally, a £40 million trust fund will be established to support the Chagossian community, with further payments earmarked for Mauritian development.


Legal Challenges and Domestic Criticism

The sovereignty transfer faced a last-minute legal challenge from two exiled Chagossians who secured an emergency injunction from a UK High Court, arguing that they were not adequately consulted. However, the court quickly discharged the order, allowing the deal to proceed.


Domestically, the agreement has sparked political backlash. UK opposition leaders, including Conservative Party head Kemi Badenoch, have criticized the Labour government for “surrendering British territory” and committing taxpayers to substantial financial obligation.


Chagossian Rights Remain in Focus

The fate of the displaced Chagossian people remains one of the most sensitive and unresolved aspects of the deal. Between 1968 and 1973, thousands were forcibly removed from the islands to facilitate the construction of the Diego Garcia base. Many now live in exile across the UK, Mauritius, and the Seychelles.


Although the agreement opens the door to potential resettlement efforts, many Chagossians have voiced concern over being marginalized in the process. Bernadette Dugasse, one of the plaintiffs in the recent court challenge, stated: “We’re not Mauritians. We want our rights respected, and we want a say in the future of our homeland.


A Diplomatic Milestone with Geopolitical Ripples

For Mauritius, the deal marks the culmination of a decades-long campaign to reverse a colonial-era injustice. For the UK, it reflects a strategic recalibration—balancing global legal expectations with continued access to a vital military outpost.


The move also has broader geopolitical implications. As Mauritius deepens economic ties with China, Western observers are closely watching how the country manages its new responsibilities—particularly in relation to security and foreign partnerships.


Conclusion

The Chagos Islands deal represents a defining moment in post-colonial diplomacy. It offers Mauritius long-denied sovereignty and recognition, while maintaining Western strategic interests in the Indo-Pacific. However, the road ahead remains uncertain, especially for the displaced Chagossian community and the future regional balance of power.

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