Region 
 

Malé

Uninvited Claim

As the UK–Mauritius deal on Chagos edges toward implementation, a late objection from the Maldives is testing just how settled “settled” really is.

By Intikhab Ulfat | September 2026

The Indian Ocean has long been a theatre of quiet geopolitical competition, where colonial history, maritime law and military strategy overlap. In 2026, the Chagos dispute acquired a new dimension when the Maldives formally objected to the UK–Mauritius agreement and asserted its own claim to the archipelago.

What London and Port Louis presented as the closing of an unfinished colonial chapter now risks becoming a wider regional controversy. The central question is whether the Maldives can delay or reshape an agreement negotiated over several years, or whether Britain is justified in treating Malé’s intervention as legally irrelevant.

The dispute originates in Britain’s decision in 1965 to detach the Chagos Archipelago from Mauritius before Mauritian independence and create the British Indian Ocean Territory. Between the late 1960s and early 1970s, the Chagossian population was forcibly removed as Diego Garcia was developed into a major UK–US military installation.

The expulsions and Britain’s continued administration of the islands transformed Chagos into one of the most prominent unresolved questions of decolonisation.

Mauritius challenged British control for decades. Its campaign achieved a major breakthrough in 2019, when the International Court of Justice concluded that the decolonisation of Mauritius had not been lawfully completed and that Britain should end its administration of the archipelago as rapidly as possible. The UN General Assembly subsequently endorsed that position.

After prolonged negotiations, Britain and Mauritius signed a treaty in May 2025. Under the agreement, Britain would recognise Mauritian sovereignty over the islands while retaining control of Diego Garcia through a 99-year lease. The financial arrangement was estimated to cost Britain an average of approximately £101 million annually.

For London, the deal appeared to resolve international legal pressure while protecting one of the West’s most strategically important military bases. Yet the settlement did not achieve the finality its architects expected. It faced resistance from British politicians, sections of the Chagossian community and, eventually, the United States.

By 2026, the agreement was already politically weakened. The Maldives is therefore not disrupting a smoothly advancing settlement. It is entering a process that was already under pressure.

President Mohamed Muizzu’s government says it submitted written objections to Britain and raised the matter directly with then-British Deputy Prime Minister David Lammy. The Maldives argues that the archipelago, known locally as Foalhavahi, possesses historical and geographical connections to the Maldivian state.

Muizzu has cited old maps, historical correspondence, traditional navigation and fishing links as evidence that the islands once lay within the Maldivian sphere. His government has also threatened to pursue the matter through international legal forums.
Muizzu frames the claim as a defence of Maldivian sovereignty against larger powers, but, while politically persuasive, it remains legally weak.

Historical contact, fishing activity and geographical proximity do not automatically establish sovereign title. International tribunals generally consider effective administration, colonial boundaries, diplomatic recognition, state practice and consistency in earlier official positions.


On these grounds, Mauritius possesses the stronger case.

The Maldives is unlikely to secure sovereignty over Chagos on the existing evidence

The 2019 ICJ opinion treated Chagos as part of colonial Mauritius. In addition, the International Tribunal for the Law of the Sea treated Mauritius as the relevant coastal state when deciding the maritime boundary between Mauritius and the Maldives.

The earlier position of the Maldivian government also complicates Muizzu’s claim. Previous Maldivian leaders had not asserted sovereignty over Chagos and had participated in proceedings that recognised Mauritius as the opposing coastal state.

A government may change its foreign policy, but it cannot easily erase the legal and diplomatic effects of its state’s earlier conduct.

The Maldives must therefore explain why its revived claim should outweigh the ICJ’s decolonisation reasoning, the maritime boundary proceedings and its own previous position.

Nor can Malé simply take Britain or Mauritius to the International Court of Justice and demand a binding decision. Contentious proceedings before the ICJ require a recognised jurisdictional basis and often depend on the consent of the states concerned.
The Maldives might seek another international forum, pursue an advisory process or frame its case around maritime rights, fisheries or environmental interests. Such action could create delay and political uncertainty, but it would not automatically invalidate the UK–Mauritius treaty.

It is therefore misleading to present Britain, Mauritius and the Maldives as three equal claimants.

Britain remains the administering power while the treaty is not implemented, but it has accepted in principle that sovereignty should transfer to Mauritius. Mauritius possesses the strongest international legal support. The Maldives has introduced a politically significant but comparatively weak sovereignty claim.

There is also another party whose interests cannot be ignored: the Chagossian people. They were forcibly removed from their homeland and were not given a decisive role in negotiating the agreement.

Any settlement that concentrates only on Britain, Mauritius and the Maldives risks repeating the original injustice by once again treating the islanders as objects of policy rather than participants in decisions concerning their own land.

The strategic centre of the dispute is Diego Garcia. The atoll hosts one of the most important American military facilities outside the continental United States. It has supported military operations across the Middle East and Afghanistan and remains central to surveillance, logistics and long-range planning across the Indian Ocean.

This explains why Washington’s position may ultimately matter more than the Maldivian objection. The base is far too important for Britain and the United States to accept prolonged uncertainty without concern.

The dispute also carries wider regional implications. India maintains close relations with both Mauritius and the Maldives and has a strong interest in Indian Ocean stability. China’s growing economic relationship with the Maldives adds another layer of strategic anxiety, although there is no clear evidence that Beijing is directing the Maldivian claim.

Even so, any prolonged controversy around Diego Garcia will inevitably be viewed through the broader competition between China, India and the United States.

Britain may be legally justified in arguing that the sovereignty settlement was negotiated with Mauritius, the state supported by major international decisions. However, dismissing the Maldives entirely would be diplomatically unwise.

The Maldives is the closest sovereign neighbour to the archipelago and has legitimate interests in fisheries, maritime boundaries, environmental protection, marine resources and regional security. These interests may not establish sovereignty, but they justify consultation.

A practical solution would separate the question of ownership from regional cooperation. Britain and Mauritius need not recognise a Maldivian sovereignty claim, but they could include Malé in discussions on fishing access, marine conservation, search-and-rescue arrangements and environmental monitoring.

Such engagement would reduce the political appeal of prolonged litigation without reopening the core question of Mauritian sovereignty.

Three outcomes remain possible. Britain and Mauritius may revive the treaty and proceed despite Maldivian objections. They may open limited consultations while preserving the basic agreement. Or the Maldives may initiate legal action, creating years of uncertainty.

The Maldives is unlikely to secure sovereignty over Chagos on the existing evidence. It is also unlikely, by itself, to destroy the UK–Mauritius settlement. But it can raise the political cost of implementation and ensure that the issue is no longer presented as purely bilateral.

Malé may never control Chagos. It may nevertheless determine whether the agreement is remembered as a final settlement or merely the beginning of another prolonged dispute in the Indian Ocean.

Read More