5 March 2026

US military base on Diego Garcia: What is its strategic importance?

Nitya Labh

President Donald Trump’s critique of the UK’s 2025 agreement to transfer sovereignty of the Chagos Archipelago to Mauritius triggered a wave of media attention in January 2026. In February, the president appeared to walk back his criticism of the deal, which would see the UK obtain a 99-year lease on Diego Garcia – the largest Chagos island and the site of a major UK/US military base.

But President Trump criticized the deal again on 18 February, linking Diego Garcia to the US military buildup for a possible strike on Iran: ‘Should Iran decide not to make a Deal,’ he said, ‘it may be necessary for the United States to use Diego Garcia… in order to eradicate a potential attack by a highly unstable and dangerous Regime.’

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