The Chagos Islands have long been a symbol of Britain’s uncomfortable colonial legacy, where strategic imperatives once trumped the rights of an indigenous population. Between roughly 1,500 and 2,000 Chagossians were forcibly removed from the archipelago from 1965 onwards to clear the way for the deployment and expansion of the US military base at Diego Garcia. Successive British governments essentially engineered what Human Rights Watch has described as “prolong Western‑backed exile,” dispersing Chagossians across Mauritius, the Seychelles, and parts of the UK, while repeatedly denying them the right to return to their ancestral homes. This pattern of forced displacement and continued obstruction has never been formally reversed, despite repeated acknowledgements at the United Nations that barring their return is unlawful.
It is against this backdrop of historic injustice that Keir Starmer’s Chagos Islands deal with Mauritius must be judged. The 2025–26 agreement, under which the UK transfers sovereignty of the archipelago to Mauritius in exchange for a 99‑year lease of Diego Garcia and a substantial financial package, is framed in London as a long‑overdue act of decolonisation. Yet for many observers, the deal looks less like a moral reckoning and more like the final layer of a long‑sustained façade: sovereignty changes hands, but the people who lived there are still barred from living there. When viewed through this lens, Starmer’s gamble is not a moral upgrade to Britain’s image, but an analysis‑rich case of how legal neatness can mask enduring injustice.
What the Chagos deal actually does
At its core, the Chagos deal is a complex bundle of legal, financial, and strategic concessions. The UK formally agrees to relinquish sovereignty over the archipelago to Mauritius, a move that Downing Street touts as “historic” and “long‑overdue.” In return, the UK secures a 99‑year lease on Diego Garcia, ensuring that the US military base remains under tight British and American control. Reports indicate that the UK has also agreed to commit around £3.4 billion (approximately $4.6 billion) to Mauritius, a sum intended to compensate for lost fishing and other economic entitlements and to underpin the political acceptability of the handover.
The UK government emphasises that the agreement “does not compromise our national security” and that the United States continues to support the arrangement, portraying it as a win‑win of decolonisation and strategic continuity. Yet beneath this neat framing lurk several troubling omissions. The deal does not explicitly grant Chagossians the right to return; instead, it entrusts displacement‑era policies to the new legal reality, effectively locking in the status quo of exile. In doing so, the UK appears to be outsourcing the appearance of decolonisation while preserving the substance of exclusion. This tension is central to any serious analysis of how the UK’s actions align—or fail to align—with its professed commitment to human‑rights norms.
United Nations warnings and the limits of treaty‑making
The United Nations has not remained silent on these developments. The UN Committee on the Elimination of Racial Discrimination (CERD) has issued a stark warning, declaring itself “deeply concerned” by the UK–Mauritius agreement and calling for ratification to be paused. The committee argues that the treaty, as drafted, “prevents the exercise” of the Chagossians’ rights to return, to culture, and to self‑determination, and that this is inconsistent with UN resolutions on decolonisation and racial equality.
In its own words, the committee stresses that the agreement risks “entrenching the forced displacement” of the Chagossian people, even as it formally ends British sovereignty. Human Rights Watch has amplified these concerns, documenting how the continuing denial of the right of return amounts to serious violations of international human rights law. The United Nations‑backed critique thus forms a crucial analysis backdrop: the UK may be formally decolonising a territory, but it is not undoing the core human‑rights violations that accompanied that colonisation. For a state that long presents itself as a defender of the rules‑based order, that disconnect is hard to reconcile.
“Crimes against humanity” and the ICC referrals
The most explosive challenge to Starmer’s Chagos Islands gamble has come in the form of allegations that the UK’s conduct amounts to more than bad policy—it may constitute crimes against humanity. A Chagos‑appointed lawyer acting as “Attorney General” has submitted detailed communications to the UN human‑rights system accusing the UK Prime Minister of “ethnic cleansing and potentially crimes against humanity” in connection with the attempted removal of four Chagossians who recently landed on the islands to re‑occupy their homeland.
Beyond the UN, Chagossian‑led groups have also reported Starmer, former Foreign Secretary David Lammy, and Defence Secretary John Healey to the International Criminal Court (ICC), alleging that they “knowingly perpetuated crimes against humanity” by blocking the right of return. The ICC referrals lean heavily on the documented history of forced displacement, the denial of repatriation, and the UK’s continued resistance to any meaningful resettlement scheme. Within this analysis frame, the Chagos deal looks less like a clean break with the past and more like a legal backdrop against which these allegations can be sharpened. If the UK now formally cedes sovereignty but still refuses to enable return, the charge is that Britain is legitimising exile through a treaty, not ending it.
The US pushback and strategic contradictions
The Chagos deal has not only been challenged by human‑rights actors; it has also drawn sharp criticism from Washington. President Donald Trump has publicly denounced the agreement as “an act of great stupidity,” arguing that it undermines the US military position in the Indo‑Pacific by surrendering sovereignty over a strategically vital base. His administration has framed the UK’s move as naive and damaging, portraying the handover as a strategic concession with little to no benefit.
This pressure has forced Starmer to recalibrate. Reports indicate that the UK has paused or delayed aspects of the ratification process, with Downing Street insisting that the UK will “never jeopardise our national security.” The optics are striking: the UK is caught between two powerful narratives. On one side, there is the moral‑political imperative to decolonise and rectify historic wrongs; on the other, there is the real‑world pressure from its closest ally to keep Diego Garcia as a US‑centred military asset. Starmer’s attempt to balance these forces through a lease‑back deal risks appearing to prioritise security entanglements over rights, even as it formally disavows colonial control. That contradiction is central to any analysis of how the UK navigates its place in the post‑colonial, post‑imperial order.
Moral standing and the UK’s image
It is this balance — or imbalance — that most directly threatens the UK’s moral standing. The UK has long presented itself as a defender of international law, human‑rights norms, and the UN‑led rules‑based order. Yet when the United Nations’ own committees warn that a British‑brokered treaty risks entrenching forced displacement and racial discrimination, that image begins to fray. When Human Rights Watch and Chagossian claimants describe the same deal as part of a broader pattern of crimes against humanity, Britain’s claim to ethical leadership looks increasingly strained.
For many observers, the Chagos Islands gamble exemplifies a recurring British tendency: to acknowledge wrongdoing in principle while finding ways to avoid meaningful remedy. The UK can admit in Geneva that barring the Chagossians’ return is unlawful; it can sign a UN resolution acknowledging the need for decolonisation; it can extol “the rules‑based international order” in speeches. But when it comes to materially reversing the harms of the past — to allowing people to return, to share control with indigenous communities, to accept genuine accountability — the government retreats into legal fictions and technical carve‑outs.
Against this backdrop, Starmer’s deal risks appearing less like a moral advance and more like a calculated exercise in risk‑containment: transferring sovereignty on paper while preserving the status quo of exile. That is why critics argue that the agreement may actually damage the UK’s moral standing, by demonstrating that even a nominally progressive government is unwilling to pay the full price of justice. Any sober analysis of the Chagos Islands case must begin with this uncomfortable question: can a state genuinely uphold human‑rights principles while maintaining decades‑long structures of exclusion under the cover of a treaty?
The final shape of the Chagos deal remains uncertain. The United Nations’ call for ratification to be paused has given Chagossian and human‑rights groups a window to push for amendments that would explicitly recognise the right of return and include safeguards for resettlement. If the UK and Mauritius respond substantively — by allowing meaningful Chagossian participation in negotiations and embedding return rights in the treaty text — the deal could yet be salvaged as a genuinely reparative act.
However, if the UK chooses instead to push the agreement through in its current form, the symbolism will be clear: the UK is willing to give up colonial sovereignty, but not colonial power over people. It may be willing to sign a treaty that looks like decolonisation, but not to dismantle the structures of exclusion that have persisted for more than 50 years. In that scenario, Starmer’s Chagos Islands gamble will stand as a cautionary tale of how governments can pay lip service to human‑rights norms while quietly entrenching their violation — and how such compromises, however strategically convenient, can erode the very moral authority that Britain claims to uphold. Any analysis of this episode must therefore treat the Chagos Islands not just as a remote archipelago, but as a test of Britain’s commitment to the United Nations’ principles it so often extols.
