Diego Garcia Exposed: New Documents Reveal Secret Operations on the Remote U.S. Island Base

Donald Trump has lashed out at British Prime Minister Keir Starmer for “taking too long” to approve American use of the joint UK-US air base on Diego Garcia for possible defensive strikes against Iran, telling London’s Daily Telegraph he was “very disappointed” by the initial refusal. Starmer reversed course late on 1 March, authorising the base for limited operations after an Iranian drone crashed into a U.K. unit in the Gulf region. The public spat has catapulted Diego Garcia—an atoll in the Chagos Archipelago—back into the geopolitical spotlight. Although the U.K. agreed in 2025 to cede sovereignty of the broader archipelago to Mauritius, it negotiated a 99-year lease that allows the U.S. to keep its largest Indian-Ocean outpost on the island. Trump’s latest comments have reopened the domestic debate in Britain over whether that deal sacrifices national security or, conversely, entrenches it by guaranteeing continued American protection. WHY DIEGO GARCIA MATTERS • Power-projection hub: The base hosts a 3.7-kilometre runway that can handle B-1 and B-52 bombers, KC-135 refuelling tankers and long-range drones, plus deep-water berths for aircraft-carrier strike groups. The atoll sits almost equidistant from the Strait of Hormuz, Bab-el-Mandeb and Malacca Strait, allowing the Pentagon to cover three critical maritime chokepoints from a single location. • Counter-Iran fallback: In the event that bases in the Gulf come under missile fire, Diego Garcia provides a launchpad beyond the range of most Iranian ballistic systems, a fact U.S. planners highlighted during both the 1991 Gulf War and the 2003 Iraq invasion. • China factor: Washington hawks argue that giving Mauritius full sovereignty could open the door to Chinese port projects in the archipelago, undermining the West’s positional advantage in the Indian Ocean. POLITICAL AFTERSHOCK IN LONDON Starmer’s hesitation has already become campaign fodder for the opposition Conservatives, who accuse the Labour leader of “paralysis in the face of Tehran.” Foreign-policy analysts note, however, that U.K. approval is legally required under the 1966 base-sharing treaty, making any automatic sign-off politically risky. Chagos campaigners, meanwhile, say the row proves that Chagossian resettlement and sovereignty questions remain subordinate to great-power jockeying. “When push comes to shove, the island is still treated as a military asset first and a homeland never,” says Olivier Bancoult, leader of the Chagos Refugees Group. WHAT HAPPENS NEXT 1. Lease ratification: Parliament must still ratify the 99-year lease in the coming months. A defeat would cast doubt on future U.S. basing rights and could force Washington to negotiate directly with Port Louis. 2. Regional balancing: India is expanding its own runway and jetty on Agaléga Island, 1,767 km southwest of Diego Garcia, signalling that New Delhi is preparing a counterweight should the U.S.–UK footprint shrink. 3. Legal challenges: Mauritius hints it could revive its International Court of Justice case if London fails to finalise the transfer by year-end, a move that would again test the island’s “strategic immunity” from international law. BOTTOM LINE The Diego Garcia dispute is no longer a colonial footnote; it is a live flashpoint that links U.S.–Iran tensions, Sino-Western rivalry and Britain’s post-Brexit role in the world. With Trump pressing for an unencumbered strike option and Starmer walking a legal tightrope, the runway in the middle of the Indian Ocean may soon decide whether London’s “special relationship” still comes with an automatic security guarantee—or whether the era of unquestioned base access is coming to an end.