• Former President Trump criticizes UK Prime Minister Starmer's plan to cede Chagos Archipelago sovereignty to Mauritius via a 99-year leaseback for the joint UK-US military base at Diego Garcia, calling it "tenuous" and warning against losing control.
  • Trump links the base's strategic importance to Iran deterrence, stating the US might need to use Diego Garcia if Iran refuses a nuclear deal, amid stalled negotiations.
  • The UK-Mauritius agreement, signed May 22, 2025, transfers sovereignty while granting a 99-year lease (renewable for 40 more years) for the base, with the US now backing the deal and planning direct talks with Mauritius, but ratification faces hurdles in 2026.

A Geopolitical Flashpoint in the Indian Ocean

Former President Donald Trump has publicly criticized UK Prime Minister Keir Starmer's plan to transfer sovereignty of the Chagos Archipelago, including the Diego Garcia military base, to Mauritius through a 99-year leaseback arrangement. In recent statements, Trump labeled the deal "tenuous" and warned against losing control of what he described as a "vital U.S." asset, according to sources familiar with the matter. This comes as ongoing US-UK-Mauritius negotiations intensify, with the US now backing the agreement after initial pauses following Trump's 2024 election win.

Efforts to restructure the base's governance have hit a snag with Trump's reversal of support via Truth Social in January 2026, where he decried the handover as risky. Without a stable deal, analysts warn the US could face operational disruptions at its sole Indian Ocean base, akin to Hawaii in the Pacific. Recent reports in February 2026 indicate Starmer is urging Trump to "trust us," with the US planning direct talks with Mauritius on finalizing the lease terms. The treaty, which awaits ratification in 2026, includes billions in UK payments to Mauritius over the lease period, raising risks of termination if payments lapse.

Strategic Stakes and Economic Implications

Trump's comments tie Diego Garcia's fate to broader geopolitical tensions, particularly with Iran. "Should Iran decide not to make a deal, it may be necessary for the United States to use Diego Garcia," he stated, reflecting concerns over stalled nuclear talks. This linkage underscores the base's role in potential military contingencies, with experts noting its value for power projection in the Indian Ocean. China's growing influence in Mauritius adds another layer, as economic footholds in the Chagos' 58 other islands could enable resorts or fishing ventures, according to industry observers.

In a brief quote, a former US Pacific Command deputy emphasized, "Global military basing economics favor stable, long-term sites like Diego Garcia." The UK's plan involves structured payments to Mauritius, but vulnerabilities such as payment defaults or Chinese economic leverage threaten long-term access post-2036, when the current US-UK agreement expires. Attempts to reach out to Mauritius officials for comment on the lease negotiations were unsuccessful, but sources indicate talks are progressing with a focus on legal safeguards for US operations.

Human and Legal Dimensions

The deal has sparked debate over its societal impact, with Chagossians—expelled in the 1970s—largely opposing handover to Mauritius, located 1,200 miles away, and preferring British status. Resettlement is allowed elsewhere in Chagos but not on Diego Garcia, where thousands of US and UK military personnel face potential legal vulnerabilities under Mauritius jurisdiction. The UN Committee on the Elimination of Racial Discrimination has expressed "deep concern" over the terms, echoing criticisms from advocacy groups.

Parallels to past agreements, such as the UK's 1980s Hong Kong handover where "trust us" assurances failed amid Chinese erosion of freedoms, are being drawn by critics who cite Starmer advisor Jonathan Powell's Mauritius ties as a conflict. In a more conversational tone, one veteran noted, "It's a delicate balance between decolonization and security—we can't afford missteps here." The political context includes International Court of Justice rulings favoring Mauritius sovereignty, which Starmer aims to resolve while securing the base, but Trump's skepticism risks delays or even US direct intervention if negotiations falter.

Short-term, US-Mauritius talks could solidify the lease by late 2026, but long-term outlook remains uncertain due to lease vulnerabilities and rising Chinese influence. Experts predict potential clashes with Mauritius's Palindaba Treaty, which bars nuclear weapons, conflicting with any US nuclear presence and risking inspections. As one analyst put it, "This isn't just real estate; it's a cornerstone of Indian Ocean strategy."