Why Have the Chagos Islands Become so Important to US President Trump? | The Global Story
•March 12, 2026
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Why It Matters
Control of Diego Garcia underpins US power projection in the Indian Ocean, and its potential loss could reshape regional security dynamics.
Key Takeaways
- •Diego Garcia hosts critical US naval and air operations.
- •UK plans to return Chagos to Mauritius by 2024.
- •Trump warns against losing strategic foothold in Indian Ocean.
- •US‑UK alliance strained over island sovereignty dispute.
- •Iran conflict may reshape military basing priorities.
Pulse Analysis
The Chagos Archipelago, officially the British Indian Ocean Territory, comprises roughly 60 islands scattered 1,250 miles northeast of Mauritius. Separated from Mauritius in 1965 during decolonisation, the territory has long been a point of contention, with the United Nations deeming the British claim illegal. Its most valuable asset, Diego Garcia, serves as a deep‑water port and airfield supporting US and allied operations across the Indian Ocean, the Middle East, and East Africa. Control of this outpost grants unparalleled surveillance and rapid deployment capabilities, making it a linchpin in global maritime security.
President Donald Trump has publicly rebuked Prime Minister Keir Starmer, insisting the United Kingdom should not relinquish Diego Garcia. Trump's criticism coincides with a broader US‑UK strategic review prompted by the escalating US‑Israel conflict with Iran. While the UK has signalled its intention to hand the islands back to Mauritius by 2024, Washington fears a loss of a critical forward base that underpins anti‑piracy patrols, intelligence gathering, and power‑projection missions. The administration has thus pressed London to maintain operational control, even as diplomatic negotiations continue.
The dispute underscores shifting geopolitical dynamics in the Indian Ocean, where China’s expanding naval footprint and Iran’s regional ambitions intensify competition for strategic sites. If the UK cedes the Chagos Islands, the United States may need to negotiate new basing rights with Mauritius or seek alternative locations, potentially altering force posture and response times. Moreover, the episode illustrates how domestic political changes—such as Starmer’s leadership—can reverberate through long‑standing security arrangements, prompting allies to reassess commitments amid evolving threats.
Original Description
US President Donald Trump has criticised Britain and its prime minister Keir Starmer over the handling of the Chagos Islands.
He criticised Starmer during a press conference where he spoke about how America’s allies have responded to the US-Israel war in Iran.
The president has said the UK should "not give away Diego Garcia", a key military base for the United States.
The Chagos Islands - officially known as the British Indian Ocean Territory - are located in the Indian Ocean about 5,799 miles (9,332km) south-east of the UK, and about 1,250 miles north-east of Mauritius.
Also known as the Chagos Archipelago, there are around 60 individual islands. The islands were separated from Mauritius in 1965, when Mauritius was still a British colony.
Asma Khalid speaks to the BBC's Diplomatic correspondent, James Landale, to find out why President Trump is so obsessed with the British territory.
He talks about the history of the islands, the military significance of the territory and what might happen next.
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Chapters:
00:00 Introduction
01:34 Where are the Chagos Islands and why do they matter?
03:00 Why does the UK own the Chagos Islands?
04:00 When did the United States become involved?
05:10 Why is the UK on track to give up the Chagos Islands?
08:22 When did Trump get involved with the Chagos Islands?
12:24 How has Trump's position evolved?
18:00 How has the US war with Iran changed things?
20:13 Why has Trump fallen out with Keir Starmer?
22:09 What happens next with the Chagos Islands?
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