The United States is weighing a dramatic move to purchase the Chagos Archipelago directly from Mauritius, a high-stakes gambit that would hand Washington permanent control over a critical Indian Ocean military hub and reshape the geopolitical balance across Africa’s eastern seaboard. The proposal, first reported by Reuters, would see the Trump administration bypass the United Kingdom — which currently leases the largest atoll to the US — and negotiate a sovereign transfer of the entire island chain.

The Chagos Archipelago sits roughly 2 000 kilometres northeast of Madagascar and roughly 1 600 kilometres from the southern African coast, putting it within striking distance of the sea lanes that carry a meaningful slice of South Africa’s east-bound trade. For Pretoria, the chain matters because it sits astride the same Indo-Pacific corridors that link Durban and Richards Bay to the markets of Mumbai, Singapore, and beyond. A shift in who controls Diego Garcia — the archipelago’s largest and only inhabited island — is therefore not some distant Caribbean-style real estate story. It is a development that South African defence watchers, port authorities, and trade strategists cannot afford to ignore.

Mauritius has, in recent years, hardened its position on the islands. The country severed the territory in 1965 as part of a deal with London, paying the then-colony roughly £3 million in compensation — a transaction that has long been disputed in international forums. The International Court of Justice ruled in 2019 that the UK’s continued administration was unlawful, and in October 2024 London agreed to hand sovereignty back to Mauritius while retaining a lease on Diego Garcia. The new Trump proposal, however, would short-circuit that arrangement entirely.

According to sources cited by The Telegraph and The Guardian, the White House believes a direct purchase would insulate the Diego Garcia base from a creeping sequence of legal and diplomatic challenges — most notably those that could follow should Mauritius tilt further into Beijing’s orbit. The base hosts B-2 stealth bombers, long-range patrol aircraft, and naval assets that are routinely rotated into the Middle East and the Horn of Africa. For Washington, losing access to it is now treated inside the Pentagon as a near-existential risk to its Africa Command posture.

Inside the US Chagos Islands deal

The numbers involved in the proposed US Chagos Islands deal are eye-watering, though no formal offer has yet been tabled. Diplomatic chatter suggests Washington could float a package worth tens of billions of dollars, mixing cash, military guarantees, and trade concessions to Mauritius.

The strategic prize for Washington is the ability to project power across three continents from a single runway. Diego Garcia is roughly 3 000 kilometres from the Persian Gulf, 4 600 kilometres from the Strait of Malacca, and within easy reach of the Mozambique Channel — a chokepoint South Africa monitors closely given its offshore gas interests and the Sasol-linked shipping routes that thread through it.

South Africa’s own posture in the Indian Ocean has been quietly evolving. The SA National Defence Force has been refreshing its maritime strategy, and the Operation Copper patrol footprint has been expanded along the east coast. Pretoria, however, has no formal position on the Chagos transfer and is unlikely to comment publicly while the deal remains a Washington–Port Louis matter. Privately, analysts at the Institute for Security Studies in Pretoria have warned that any expansion of US basing rights in the western Indian Ocean will be read in Beijing, New Delhi, and Moscow as a direct signal about Washington’s Africa priorities.

The Mauritian government, for its part, has not confirmed any negotiations. Prime Minister Navin Ramgoolam’s administration came to power in late 2024 on a platform of economic delivery, and the prospect of a multi-billion-dollar injection into the country’s coffers is politically tempting. Mauritius, with a population of just 1.3 million, sits on a sovereign debt pile that has spooked credit ratings agencies in recent cycles. A US buyout would, in theory, give Port Louis fiscal oxygen that no IMF package could match.

Critics, however, are warning that the deal is a non-starter. Chagossians — the displaced islanders who were removed from the archipelago between 1967 and 1973 to make way for the US base — have waged a long legal battle for the right to return. Under any purchase arrangement, their claims would arguably be extinguished by a sovereign Mauritian sale, raising fresh human-rights questions. The UN’s special rapporteur on the right to housing has already flagged that the 2024 UK–Mauritius agreement contains return provisions that could be undermined by a Trump-era cash deal.

There is also the matter of Britain. London has invested considerable diplomatic capital in the October 2024 framework, which it viewed as a face-saving compromise. A US move that goes around Westminster would, in the words of one Whitehall source quoted by The Guardian, “make the special relationship look like a special arrangement the Americans can override at will.” Parliament’s foreign affairs committee has already asked for a briefing.

For South African readers, the most under-reported angle is what happens to the African Union’s collective position. The AU’s 2020 declaration on Indian Ocean security called for member states to coordinate more closely on maritime governance, but few countries have the military reach to assert a meaningful presence near the Chagos chain. South Africa is the only AU member with a navy capable of sustained blue-water operations in the region, and yet its current budget pressures have kept its frigate fleet under-strength.

If the US Chagos Islands deal proceeds, it will likely harden into one of the defining strategic transactions of the decade — one that locks American power into the Indian Ocean for another generation, sidelines both London and Beijing, and hands Mauritius a once-in-a-century payday. For South Africa, the smart move is to keep quiet in public, watch the legal terrain closely, and ensure that whatever emerges does not crowd out Pretoria’s own, still-nascent plans for an Indian Ocean role worthy of the country’s geography.