The United Kingdom is reconsidering its agreement to transfer sovereignty of the Chagos Islands to Mauritius, Defence Secretary Wes Streeting announced, following renewed criticism from US President Donald Trump at the United Nations General Assembly.
A strategically significant military installation operates on Diego Garcia, the archipelago's principal island, making the territory crucial to Anglo-American defence interests in the Indian Ocean region.
Under the original arrangement negotiated by Prime Minister Sir Keir Starmer's government, Britain would relinquish sovereignty to Mauritius while paying approximately £101 million ($136 million) annually to maintain joint operational control of the military base with the United States.
Trump had previously withdrawn American backing for the arrangement in April, prompting the UK to suspend the deal indefinitely. His latest remarks at the UN have now triggered a formal reassessment of the agreement's viability.
Why is the UK reviewing the deal?
The review has become necessary because American support remains absent, according to Streeting. Speaking to a national broadcaster on Wednesday, he explained that Trump's recent comments confirmed the US administration's continued opposition to the current framework of the agreement.
What President Trump said yesterday wasn't new but I think it does provide absolute clarity that his position on this Chagos deal as currently drafted is not changing. So we have to do more work with our American allies, with President Trump and his administration, to get the deal to a place where we can support it.
We have to review the deal because the United States doesn't support it.
The defence secretary indicated that further negotiations with the Trump administration would be necessary to reshape the agreement into a form acceptable to both nations.
What is the strategic importance of the islands?
The Chagos archipelago holds significant military value due to its position in the Indian Ocean, making it essential for maintaining Western defence capabilities in a strategically contested region. The base on Diego Garcia serves as a critical hub for surveillance, logistics, and power projection across the Indian Ocean and beyond.
This strategic importance explains why the United States has consistently prioritised maintaining access to the facility, even as the UK has sought to resolve its long-standing dispute with Mauritius over sovereignty of the territory.
Background to the agreement
The sovereignty transfer represented an attempt to resolve decades of tension between Britain and Mauritius over control of the archipelago. When the UK paused the deal in April following Trump's initial withdrawal of support, it reflected the administration's determination to preserve American influence over the military installation regardless of the political costs to Britain's relationship with Mauritius.
The broader context of Trump's approach to overseas territories has become apparent through his recent comments on other British possessions. The US president has indicated that American policy toward the Falkland Islands is also under review, signalling a comprehensive reassessment of US positions on territories with strategic or symbolic significance.
What happens next?
British officials must now engage in intensive discussions with the Trump administration to determine whether modifications to the agreement could secure American approval. The defence secretary's comments suggest that the current structure of the deal—which would transfer sovereignty while maintaining joint military control—remains unacceptable to Washington in its present form.
The outcome of these negotiations will determine whether Britain can proceed with resolving its dispute with Mauritius or whether the arrangement will remain suspended indefinitely, leaving the territorial question unresolved.
