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Labour’s Chagos Islands defence just hit a major stumbling block
The article argues that the Government’s case for transferring sovereignty of the Chagos Islands to Mauritius has been weakened by a minister’s written answer about the UK’s legal protections under the UN Convention on the Law of the Sea (UNCLOS). It says ministers presented an urgent legal threat as a key reason for the deal, which transfers sovereignty while leasing Diego Garcia back to the UK for a joint UK-US military base.
Foreign Office Minister Uma Kumaran said on 28 October that the UK’s Article 298 declarations apply to all UK overseas territories where UNCLOS applies, including the British Indian Ocean Territory. Article 298 allows countries to exclude disputes about military activities from compulsory international adjudication. The article argues this means the protection covered the whole Chagos territory, and notes that the International Tribunal for the Law of the Sea cannot order one country to transfer its land to another.
In short
- A minister said UNCLOS protections extend across the Chagos Islands.
- The article says this challenges the Government’s case for the sovereignty deal.
- Britain will lease Diego Garcia back for its joint UK-US military base.
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
The minister’s answer appears to weaken the claim that an urgent UNCLOS legal threat made transferring sovereignty necessary: the UK had declared an exclusion for military disputes covering the British Indian Ocean Territory, and the tribunal could not itself order a land transfer. That raises a reasonable question about whether the Government overstated the legal risk or gave Parliament a complete account of its alternatives.
The case against
The answer may clarify the scope of the UK’s declarations without settling every legal risk associated with the islands or the military base. The Government can reasonably argue that a negotiated settlement offered greater long-term legal certainty and helped protect the base, even if UNCLOS could not directly compel a transfer of sovereignty.
Explained simply
The Chagos Islands are in the Indian Ocean and have been under British control since the 1960s. The largest island, Diego Garcia, hosts a joint UK-US military base; the Chagossians, many of whom were removed from the islands to make way for it, have long sought a return and a say over the islands’ future.
The UK and Mauritius agreed a deal under which Mauritius would gain sovereignty, while the UK would lease Diego Garcia for the base. Ministers have said the agreement addresses legal risks to Britain’s position, including disputes under the UN Convention on the Law of the Sea, which sets rules for countries’ use of the oceans.
One provision of that treaty lets countries exclude some disputes over military activity from compulsory international hearings. The debate over how far the UK’s declaration applies matters because it bears on the legal arguments for the agreement and the future governance of the islands.
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