Mauritius has renewed its vow to “decolonise” the Chagos Islands, following the shelving of legislation by the UK government under Prime Minister Keir Starmer that would have facilitated the handover of the archipelago. This development, announced on Sunday, April 12, 2026, reignites a long-standing territorial dispute and underscores the complex geopolitical factors at play, particularly concerning the crucial US-UK military base on Diego Garcia. The renewed commitment from Port Louis signals an intensified diplomatic and legal battle over the strategically vital Indian Ocean territory.
The Chagos Archipelago was detached from Mauritius by the United Kingdom in 1965 to form the British Indian Ocean Territory (BIOT), three years before Mauritius gained independence. This separation was a precondition for Mauritius’s independence, with the UK providing a £3 million grant and a commitment to return the islands when no longer needed for defense purposes. Between 1967 and 1973, the entire Chagossian population was forcibly removed to make way for a joint UK-US military base on Diego Garcia, the largest island. This historical context forms the bedrock of Mauritius’s claim, supported by international legal bodies.
International Rulings and Shelved Plans
The legality of the UK’s administration has been repeatedly challenged in various international forums. In 2019, the International Court of Justice (ICJ) issued an advisory opinion stating that the UK’s separation of the Chagos Islands was unlawful and that its continued administration was a “wrongful act.” The ICJ concluded that the decolonisation of Mauritius was not lawfully completed. Later that year, the UN General Assembly adopted a resolution affirming that the Chagos Archipelago “forms an integral part of the territory of Mauritius” and demanded the UK withdraw its colonial administration within six months.
In a significant development in May 2025, the UK and Mauritius signed an agreement for the transfer of sovereignty over the Chagos Archipelago to Mauritius. This deal, backed by then-US President Joe Biden, would have seen the UK pay approximately £101 million per year for 99 years to lease the Diego Garcia base. However, the UK government under Prime Minister Keir Starmer was forced to shelve the legislation required to enact this handover in April 2026. This unexpected reversal has plunged the future of the Chagos Islands into renewed uncertainty.
“The delay leaves the indigenous Chagossian people, who were forcibly displaced, in limbo. Many Chagossians have expressed feelings of betrayal, arguing that their rights and interests have been overlooked in these negotiations.”
The shelving of the handover plan is primarily attributed to a lack of support from US President Donald Trump, who criticized the deal as a “big mistake” and an “act of great stupidity.” This highlights the significant influence of the US, given the strategic importance of the Diego Garcia military base. The base is considered a “key strategic military asset” for both the UK and the US, crucial for regional and global security. Without the explicit backing of the US, the UK government found itself unable to proceed with the necessary legislative steps.
Chagos Islands Decolonisation Efforts Intensify
Mauritian Foreign Minister Dhananjay Ramful has stated that his government will “spare no effort to seize any diplomatic or legal avenue to complete the decolonisation process.” This suggests that Mauritius will continue to pursue its claim through international legal and political channels, potentially increasing diplomatic pressure on the UK. The commitment to more trending stories underscores a resolute stance from Port Louis, determined to reclaim what it considers its sovereign territory. The ongoing impasse also reflects strained relations between the UK and the US under their respective leaders, Keir Starmer and Donald Trump. Trump’s criticism of the Chagos plan, alongside other disagreements, has impacted the UK’s ability to proceed with the legislation. The UK government has explicitly stated that it would only proceed with the deal if it had US support, a condition that now appears unmet.
The dispute over the Chagos Islands is not merely a territorial one; it is deeply rooted in decolonisation principles and international law. The UN General Assembly and the ICJ have consistently supported Mauritius’s claim, viewing the detachment of the islands as a violation of resolutions banning the dismemberment of colonial territories before independence. This firm international consensus provides Mauritius with a strong legal and moral foundation for its renewed efforts to decolonise the Chagos Islands.
The future of the Chagos Islands remains highly uncertain. Mauritius is firmly committed to its decolonisation efforts, while the UK needs to navigate its complex relationship with the US, particularly under the current presidential administration, all while adhering to the weight of international legal opinions. The outcome of this renewed push by Mauritius will have significant implications for international law, decolonisation efforts globally, and the strategic military landscape of the Indian Ocean. All eyes will be on the diplomatic and legal manoeuvres to come, as Mauritius seeks to finally complete its territorial integrity.
