Introduction

The UK government is revisiting its agreement to transfer sovereignty of the Chagos Islands to Mauritius, prompted by strong opposition from the United States. Defence Secretary Wes Streeting says the deal cannot move forward without American backing, triggering a formal review with no set timeline.

What Happened

The original agreement, negotiated under former Prime Minister Sir Keir Starmer, would have seen the UK cede control of the Chagos archipelago to Mauritius while retaining a 99-year lease on the Diego Garcia military base. In April 2026, the deal was paused indefinitely after US President Donald Trump called it terrible during the UN General Assembly. Since then, Streeting has insisted the government must review the arrangement because the US position remains unchanged.

Why This Matters

Diego Garcia hosts a strategically vital joint UK-US military installation, described by Streeting as one of the most sensitive and valuable national security assets. The outcome of the review could shape regional security dynamics, influence Chinas growing presence in the Indian Ocean, and determine whether the UK can maintain its strategic foothold without jeopardising the alliance with the United States.

Key Takeaways

  • The UK is reopening negotiations on the Chagos Islands handover after US President Donald Trump denounced the deal as terrible at the UN General Assembly.
  • Defence Secretary Wes Streeting says the agreement cannot proceed without US support, forcing a strategic reassessment.
  • The original deal would have transferred sovereignty to Mauritius while leasing Diego Garcia for 99 years, estimated to cost 3.4bn according to government figures.
  • Critics argue the real cost could reach 35bn when inflation is factored in, and warn that a weakened UK presence could allow China to expand its influence.
  • No formal timeline has been set for the review, and government sources insist the core position that US approval is essential remains unchanged.

Conclusion

The Chagos Islands deal hangs in the balance as the UK balances diplomatic pressure, national security needs, and US political realities. With no immediate resolution in sight, Streeting and the government face the challenge of crafting an agreement that satisfies both American allies and Mauritian sovereignty claims while safeguarding the critical Diego Garcia base.