🗞️ Why in News The United Kingdom has suspended the previously negotiated deal to transfer sovereignty of the Chagos Archipelago (British Indian Ocean Territory — BIOT) to Mauritius, following strong opposition from the United States under the Trump administration. The deal’s collapse has significant implications for Indo-Pacific geopolitics, Indian Ocean security, and the rights of the displaced Chagossian people.
The Chagos Archipelago is one of the last unresolved chapters of British colonial territorial arrangements in the Indian Ocean. It sits at the intersection of colonial history, international law (the ICJ’s 2019 advisory opinion), great power competition (the US military presence at Diego Garcia), and the rights of a displaced indigenous community.
What Is the Chagos Archipelago?
| Feature | Detail |
|---|---|
| Location | Central Indian Ocean (~1,600 km south of India’s tip) |
| Official designation | British Indian Ocean Territory (BIOT) |
| Total islands | ~58 small islands across 7 atolls |
| Most strategically significant island | Diego Garcia |
| Diego Garcia | Hosts a major US-UK joint military base — critical for Indian Ocean, Persian Gulf, and Asia-Pacific operations |
Diego Garcia — Strategic Significance
Diego Garcia is one of the most strategically positioned military bases in the world:
- US Navy Support Facility (NSF) Diego Garcia — home to B-52 strategic bombers, P-8 maritime patrol aircraft, and pre-positioned military equipment
- Used as a launch pad for operations in the Gulf War (1990–91), Operation Enduring Freedom (Afghanistan, 2001), and Iraq War (2003)
- Enables power projection across the Indian Ocean Region (IOR), Arabian Sea, and Bay of Bengal
- Its location is equidistant from the Persian Gulf and the Malacca Strait — two of the world’s most critical maritime chokepoints
Colonial History
Displacement of the Chagossians
When the UK excised the Chagos Archipelago from Mauritius in 1965 (three years before Mauritius’s independence in 1968) to create BIOT, the approximately 2,000 Chagossian people who had lived there for generations were forcibly displaced to Mauritius and the Seychelles between 1968 and 1973.
This deportation — carried out to clear the islands for the US military base — was later found by UK courts to have been unlawful. The Chagossians have fought for decades for the right to return.
| Timeline | Event |
|---|---|
| 1965 | UK detaches Chagos from Mauritius before independence |
| 1968 | Mauritius gains independence (without Chagos) |
| 1968–73 | Chagossian community forcibly removed |
| 2000 | UK High Court: removal of Chagossians was unlawful |
| 2004 | UK government issued Orders in Council blocking return |
| 2008 | House of Lords upheld Orders in Council (government appeal) |
| 2019 | ICJ advisory opinion: UK must return Chagos to Mauritius |
| 2024 | UK-Mauritius deal agreed under previous UK government |
| 2026 | UK suspends deal under US pressure |
The ICJ Advisory Opinion (2019)
The International Court of Justice, in its February 25, 2019 advisory opinion, concluded that:
- The decolonisation of Mauritius was not lawfully completed when Mauritius became independent in 1968 without the Chagos Islands
- The UK’s continued administration of BIOT constitutes a wrongful act under international law
- The UK has an obligation to end its administration of Chagos as rapidly as possible
The UN General Assembly subsequently adopted a resolution (116 votes in favour) calling on the UK to withdraw from Chagos within six months. The UK and US voted against the resolution.
The Deal — and Its Suspension
What Was Agreed (2024)
The UK government under Prime Minister Rishi Sunak (and later confirmed under Keir Starmer’s government) reached a framework agreement with Mauritius:
- Mauritius would receive sovereignty over the Chagos Archipelago
- The UK (and US) would retain a 99-year lease on Diego Garcia for the military base
- UK would pay Mauritius significant financial compensation
Why the US Objected
The Trump administration’s stated concerns centred on:
- Sovereignty transfer to a small nation potentially susceptible to Chinese influence in the Indian Ocean
- Concerns about the long-term security of Diego Garcia under a 99-year lease rather than indefinite British territorial control
Current Status
The UK has suspended the deal pending renegotiation. The Mauritian government has protested, noting the ICJ opinion supports its claim.
India’s Stakes
| Dimension | Detail |
|---|---|
| Indian Ocean geography | Chagos is ~1,600 km south of India’s southern tip — within India’s strategic neighbourhood |
| Indo-Pacific security | Diego Garcia is a key node in US Indo-Pacific operations — India-US defence partnership (COMCASA, BECA) affects access dynamics |
| Chinese angle | If Mauritius (or a future government) granted China access post-sovereignty transfer, it would create a strategic security concern for India |
| Chagossian precedent | India’s own tribal displacement debates find parallel in Chagossian forced removal |
UPSC Relevance
| Paper | Angle |
|---|---|
| GS2 — International Relations | Decolonisation, ICJ advisory opinions, Indo-Pacific geopolitics |
| GS2 — IR | US-UK special relationship; India’s extended neighbourhood |
| GS3 — Security | Indian Ocean Region (IOR); maritime chokepoints; Diego Garcia |
| Mains Keywords | BIOT, ICJ advisory opinion, decolonisation, IOR, Diego Garcia, Indo-Pacific, Chagossian people |
📌 Facts Corner
Chagos Archipelago: British Indian Ocean Territory (BIOT) | Diego Garcia: US-UK joint military base | Chagossians: ~2,000 displaced 1968–73 | ICJ opinion (Feb 25, 2019): decolonisation of Mauritius incomplete; UK must end administration | UK-Mauritius deal (2024): sovereignty to Mauritius + 99-year Diego Garcia lease | Deal suspended: 2026 — US pressure under Trump administration | UN UNGA vote (2019): 116 countries supported Mauritius | Location: Indian Ocean, ~1,600 km south of India | Mauritius independence: 1968 | GS2: International Relations, Security & Defence
