UK Pauses Chagos Islands Sovereignty Transfer Amid US Opposition
The United Kingdom has paused the planned transfer of sovereignty over the Chagos Islands to Mauritius, following sustained opposition from US President Donald Trump, who characterized the agreement as "an act of great stupidity."
The decision places the deal into a state of indefinite suspension, as the UK government stated it would only proceed with the transfer with US support. Concurrently, the strategic importance of the joint US-UK military base on Diego Garcia was underscored when Iran launched ballistic missiles toward the island.
UK Pauses Chagos Islands Sovereignty Transfer
Decision to Pause
The British government has paused a bill that would have transferred sovereignty of the Chagos Islands to Mauritius. The bill was removed from the parliamentary agenda scheduled to begin on May 13. A UK government spokesperson stated that the decision was made because the proposed agreement lacked support from US President Donald Trump.
"We have always said we would only proceed with the deal if it has US support."
— UK Government Spokesperson
The UK government affirmed its continued belief that the agreement is the best way to ensure the long-term security of the Diego Garcia military base and stated it is continuing to engage with the US and Mauritius on the matter. Simon McDonald, a former senior civil servant in the UK Foreign Office, stated that the agreement had been forced to "go into the deep freeze for the time being" due to Trump's position.
Statements from Governments and Groups
UK Government Spokesperson:
"Diego Garcia is a key strategic military asset for both the UK and the US. Ensuring its long-term operational security is and will continue to be our priority – it is the entire reason for the deal. We continue to believe the agreement is the best way to protect the long-term future of the base."
Mauritian Foreign Minister Dhananjay Ramful stated that the government would "spare no effort to seize any diplomatic or legal avenue to complete the decolonisation process in this part of the Indian Ocean," describing the issue as "a matter of justice."
Toby Noskwith, spokesperson for the Indigenous Chagossian People campaign group, welcomed the pause, stating: "The disastrous folly of the past 18 months, predicated on delegitimising and tormenting an entire population, has rightly been defeated."
Former UK Foreign Office Senior Civil Servant Simon McDonald:
"When the president of the United States is openly hostile, the government has to rethink, so this agreement... will go into the deep freeze for the time being."
Background of the Agreement
The proposed agreement, jointly announced by the UK and Mauritius in May 2025, sought to address a long-standing territorial dispute. The Chagos Islands were separated from Mauritius in 1965, three years before Mauritius gained independence.
Under the proposed terms, the UK would transfer full sovereignty of the Chagos archipelago to Mauritius while retaining control of the joint US-UK military base on Diego Garcia through a 99-year lease, with an option for extension, at an annual cost reported to be approximately £101 million ($136 million).
Rationale for the Deal
The UK government previously justified the agreement as necessary to address international legal challenges, including a 2019 non-binding advisory opinion from the International Court of Justice (ICJ) recommending that the UK relinquish control of the islands. The UK argued that without a negotiated settlement, the base's operations could be undermined by legal rulings.
US Position
President Donald Trump publicly opposed the sovereignty transfer on multiple occasions across several months, despite his administration having previously expressed support for the deal. Key statements chronologically include:
- October 2024: The UK and Mauritius reach an agreement in principle. The Trump administration's State Department conducts a three-month interagency review and later expresses public support.
- January 2026: Trump calls the agreement "an act of great stupidity" and "total weakness" on Truth Social.
- February 2026: After speaking with UK Prime Minister Keir Starmer, Trump says Starmer made the "best deal he could make."
- Weeks later: Trump writes that ceding the Chagos Islands would be "a blight on our Great Ally" and that Starmer was "making a big mistake."
Trump linked the Chagos Islands issue to his stated interest in the United States acquiring Greenland, suggesting that the UK's decision provided a rationale for his position on Greenland. He argued that China and Russia would interpret the sovereignty transfer as a sign of weakness.
Humanitarian Impact
The establishment of the military base on Diego Garcia in the 1960s and 1970s led to the forced displacement of approximately 2,000 indigenous Chagossians, who were relocated primarily to Mauritius and the Seychelles. Some Chagossians expressed concerns about potential persecution if the islands were transferred to Mauritius, and have brought compensation claims in British courts.
Iranian Missile Strike on Diego Garcia
Incident Description
Iran launched two intermediate-range ballistic missiles toward the joint US-UK military base on Diego Garcia in the Indian Ocean. According to US, UK, and Israeli officials, one missile was intercepted and destroyed by US defenses, and the other broke apart or failed during flight. The missiles did not strike the base.
UK Defence Secretary John Healey confirmed that two Iranian missiles were launched toward Diego Garcia, stating that neither missile came close to the island and that normal operations continued.
Iran's Ministry of Foreign Affairs denied responsibility for the launches. Spokesman Esmaeil Baghaei described the claim as an "Israeli false flag" attack.
Missile Range and Capabilities
Diego Garcia is located approximately 3,800 to 4,000 kilometers (2,360 to 2,500 miles) from Iran. This distance exceeds Iran's previously self-imposed missile range limit of 2,000 kilometers (1,242 miles), which Iranian Foreign Minister Abbas Araghchi had stated was intentional to avoid being perceived as a threat.
Analysts have offered several explanations for the extended range:
- Modified Warhead: Iran may have used a missile such as the Khorramshahr-4 with a lighter explosive payload to increase its range.
- Space Launch Vehicle: Iran may have used its Simorgh or Ghaem-100 space launch vehicles, designed for satellite launches, as improvised ballistic missiles. Analysts note this could achieve the required distance but might reduce military accuracy.
- ICBM Development: Some experts suggested the launch may be linked to the development of an intercontinental ballistic missile (ICBM). An unclassified 2025 Defense Intelligence Agency assessment suggested Iran could develop a "militarily-viable" ICBM by 2035.
International Reactions and Statements
Israel Defense Forces (IDF): Military chief Eyal Zamir claimed Iran used "a two-stage intercontinental ballistic missile with a range of 4,000km" and stated that the capability could threaten European cities including Berlin, Paris, and Rome.
UK Government: Foreign Secretary Yvette Cooper condemned "Iran's reckless attacks" but stated the UK holds a different view from the US and Israel regarding the broader conflict. Communities Secretary Steve Reed stated no UK assessment supported the claim that Iran intended to attack Europe or possessed the capability to do so.
Ministry of Defence (MoD): A spokesperson stated that "Iran's reckless attacks" threaten British interests and allies, confirming that RAF jets and other UK military assets continue to defend personnel in the region.
NATO: Secretary-General Mark Rutte could not confirm Israel's assertion that Iranian intercontinental ballistic missiles were used.
Strategic Context
The missile launch occurred following a period of escalating military conflict involving the US, Israel, and Iran. The UK initially declined US requests to use British airbases for attacks on Iran in late February, citing potential breaches of international law. The UK subsequently granted permission for the US to use British bases for specific, limited defensive operations targeting Iranian missile sites.
The Diego Garcia base hosts approximately 2,500 predominantly US military and civilian personnel and is described by the US as a crucial platform for security operations across the Middle East, South Asia, and East Africa.
The base has supported US military operations in conflicts including Vietnam, Iraq, and Afghanistan, and has also been linked to US rendition flights.