European Security — 2026-04-13

UK Declares Chagos Islands Treaty Impossible After US Withdraws Support

A UK Foreign Office minister told Parliament that the treaty to cede sovereignty of the Chagos Islands to Mauritius has become 'impossible to agree at political level' and the corresponding bill will not pass. Minister Stephen Doughty said the agreement was originally negotiated in close coordination with Washington, but President Trump's position has changed. The collapse leaves unresolved the future of Diego Garcia, which hosts a strategically vital US-UK military base in the Indian Ocean used for P-8A maritime patrol operations during the Iran conflict.

Analysis
The shift from 'paused' (reported April 11) to 'impossible' is a material escalation. Diego Garcia hosts the closest US-UK military base to the Indian Ocean theater; its strategic value has increased during the Iran conflict as P-8A Poseidon maritime patrol flights operate from the atoll. The treaty collapse eliminates near-term sovereignty transfer risk but leaves the legal basis unresolved: the ICJ ruled the UK's continued possession unlawful. London faces a choice between maintaining an internationally contested military asset and rebuilding the relationship with Mauritius on different terms.

2 sources

Chagos Islands treaty is now impossible to agree at political level, UK minister says - The Guardian
UK shelves Chagos Islands deal following lack of support from Trump - MercoPress