The British Indian Ocean Territory, which includes the Chagos Islands, is set to be handed over to Mauritius after nearly 59 years under British control. Britain and Mauritius announced a historic agreement on October 3 for the sovereignty transfer of the archipelago, including the strategically important island of Diego Garcia. The deal will legitimize the United States’ use of the critical military facility on Diego Garcia.
The decades-long sovereignty dispute had impacted the U.S. military presence in the Indian Ocean and strained relations with multiple island and littoral nations. The joint statement reveals that formal treaty negotiations will now begin. Key points to be addressed include timelines, financial terms, Britain’s ongoing sovereign rights, base consultation arrangements, and Diego Garcia’s status under the African Nuclear-Weapons-Free Zone Treaty.
The British Indian Ocean Territory was originally established in 1965 to facilitate a joint UK-U.S. military facility on Diego Garcia. The territory was carved out by separating parts of Mauritius and the Seychelles before their independence, with Britain agreeing to return the islands once they were no longer needed for defense purposes.
Sovereignty transfer agreement takes shape
Mauritius’ efforts to reclaim the Chagos Archipelago culminated in a landmark 2019 international law opinion deeming Britain’s retention of the islands illegal. The pivotal shift came under former British Prime Minister Liz Truss, leading to announced negotiations in late 2022. Several crucial issues remain unresolved, including the specific timeframe for the sovereignty transfer and the financial terms of the agreement.
Negotiation of detailed consultation agreements over military use of Diego Garcia will also be vital. An important aspect of the agreement is the provision for the return of forcibly displaced former inhabitants of the Chagos Archipelago, except for Diego Garcia. The feasibility and acceptability of resettling on other islands within the archipelago remain uncertain.
Despite these complexities, the eventual treaty will resolve a protracted controversy affecting the Anglo-American military presence in the Indian Ocean. It will also reinforce the West’s commitment to international law as China extends its influence in the region.
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