US President Donald Trump has once again linked global territorial disputes to his push for acquiring Greenland, this time invoking the United Kingdom’s decision to transfer sovereignty over the Chagos Islands to Mauritius. In a sharply worded post on Truth Social, Trump criticised the move as a serious national security blunder and used it to justify his argument that the United States must take control of Greenland, even though he had previously expressed support for the same Chagos agreement.
Targeting UK Prime Minister Keir Starmer, Trump described Britain’s plan to hand over the Chagos Islands—home to the strategically critical US military base at Diego Garcia—as an “act of great stupidity.” He argued that relinquishing sovereignty over such a vital location weakened Western security and reinforced his view that the US needed Greenland to safeguard its strategic interests.
Trump’s remarks came just hours after Starmer publicly highlighted his close working relationship with the US President while addressing the Greenland issue from Downing Street. The timing underscored a growing contrast between diplomatic reassurances from London and Trump’s increasingly confrontational rhetoric.
The Chagos Islands agreement itself dates back to May last year, when the UK agreed to return sovereignty of the territory to Mauritius after years of negotiations. Under the deal, Britain would retain control of the joint UK–US military base on Diego Garcia by leasing it for 99 years at an annual cost of £101 million. At the time, senior US officials had welcomed the arrangement, and Trump had also signalled his approval during earlier interactions with British leaders.
By 2026, however, Trump’s priorities appear to have shifted. He is now openly focused on annexing Greenland, a semi-autonomous territory under Denmark, arguing that the Arctic island is essential to counter the growing influence of Russia and China in the region. He used the same logic while attacking the UK over the Chagos deal, claiming that rival powers only respond to strength and would interpret Britain’s move as a sign of weakness.
According to Trump, transferring sovereignty of the Chagos Islands risks opening the door to Chinese or Russian influence in the Indian Ocean, even if the US military presence remains intact. Analysts say this concern underpins his broader worldview, where territorial control is seen as the ultimate guarantee of security.
Britain’s control of the Chagos Islands dates back to 1968, when it purchased the territory from Mauritius shortly before granting the country independence. Mauritius has long argued that it was coerced into giving up the islands and that the separation violated international law. That position gained traction after the International Court of Justice ruled that the UK should end its administration of the islands as soon as possible.
After more than a decade of diplomatic talks, a final agreement was reached in October 2024 and formally announced the following year. The deal was welcomed by several countries, including India, which has consistently supported Mauritius’s decolonisation claim and approved substantial financial assistance to help manage the returned territory.
For the United States, Diego Garcia remains a cornerstone of its global military posture. The base hosts around 2,500 American personnel and provides critical reach across the Indian Ocean, the Middle East and parts of Asia. It has been used extensively during major military operations, including the Gulf War and campaigns in Iraq and Afghanistan, and has long been valued for its proximity to key international shipping lanes.
Trump’s abrupt reversal on the Chagos Islands has therefore sparked speculation that his broader ambitions may extend beyond Greenland. Critics argue that his comments reflect a pattern of framing allied decisions as security failures, while supporters say he is highlighting vulnerabilities that others prefer to ignore. Either way, his latest remarks have added fresh uncertainty to already strained transatlantic relations.
