On March 21, 2026, Iran fired two ballistic missiles at Diego Garcia. The base is located around 3,800 kilometers away from Iran. Iran’s foreign minister recently, in early March, has publicly admitted that the range of its missiles reaches 2,000 kilometers. The missiles did not hit the base, one failed mid-flight and the other one was picked up by a U.S. warship. But the strike demonstrated that the Indian Ocean was a scenario where Iran possessed intermediate range ballistic missiles that it did not officially admit to having and had no qualms about firing against a British-U.S. military base in the middle of the sea.
Three months later, the White House is mulling an outright purchase of the islands.
The timing is not coincidental. The story of why America may purchase an Indian Ocean archipelago from the small island nation of Mauritius, bypassing its closest ally in the process, is really a story about what the Iran war revealed, what the sovereignty dispute exposed, and why a coral atoll the size of a small town has become one of the most contested pieces of real estate in the world.
What Diego Garcia Actually Is
Diego Garcia is a coral atoll in the Indian Ocean, 17 square miles in total area, which sits in the geographic center of the Indian Ocean, about 1,000 miles south of India. It has a 3,600-meter runway that can accommodate B-52, B-1 and B-2 bombers. It is capable of hosting up to 30 warships at a time on its port. It is located on top of the sea routes transporting oil from the Gulf to Asia and Asian imports to Europe. In military jargon, it’s an “unsinkable aircraft carrier”—a floating base for projecting power over a wide range, from East Africa to the Persian Gulf and all the way to the Indo-Pacific.
The base has conducted strike operations in Iraq, Afghanistan, and the Persian Gulf during the Gulf War. In the 2026 Iran war it was a launch pad for B-2 stealth bombers targeting Iran’s nuclear sites. It was not only a military attack Iran was trying to make on the base in March, but a statement as well: We can shoot missiles at you from anywhere and wherever you’ve been relying on for fifty years is not a place that’s going to keep you safe.
It was, however, an uncomfortable discovery that Diego Garcia’s physical isolation, always one of its key strategic strengths, is not protection from attack by Iran. The bottom is located in the middle of the ocean, away from any land-based air defense network, and is reliant on the defense of naval assets, and is now proven to be within range of the ballistic missiles fired by a regional power that everyone thought were shorter ranged than they were.
The Sovereignty Mess Before the Missiles Hit
Much of the legal wrangling surrounding Diego Garcia had been in existence long before Iran had ever fired a missile in 2026. To grasp it, one must go back to 1965, when the UK removed the Chagos Islands from Mauritius prior to granting independence to Mauritius. The detachment was challenged right from the beginning. In the late 1960s and early 1970s, the Chagossian population (c. 1,500) was forcibly removed to make way for the military base. In 2019, the International Court of Justice ruled the UK’s ongoing administration of the Chagos Islands is illegal, and that it should end the administration as soon as possible.
In May 2025, faced with significant international and legal pressure, the UK signed an accord to cede sovereignty over Chagos to Mauritius and leased back Diego Garcia for 99 years for around £101m a year. The agreement was meant to end a dispute from the colonial days with the aim of keeping the base in operation.
Then Trump said it was a “big mistake. Next, the State Department endorsed it. Then Trump said it was an “act of total weakness. The State Department made a statement claiming that it “supports” the UK decision. Then Trump said it was the “best” deal that Starmer “can”. Next, Trump repeated his “big mistake” comment. In April 2026, the UK government, unable to reconcile the various messages from Washington, stalled the deal.
Now, the White House is said to be working on a plan to skip the UK and buy the islands outright from Mauritius. The US State Department has not confirmed the report. The White House hasn’t denied it. There is no official comment from the UK. Mauritius has also been silent, as it is set to receive a big sovereign wealth payment if the deal is concluded.
What America Is Actually Worried About
The strategic concern driving the purchase proposal is not primarily about Iran, though the missile attack focused minds considerably. It is about China.
Mauritius has developed increasingly warm ties with Beijing over the past decade. Chinese infrastructure investment has been significant. The concern in Washington, raised explicitly by US senators and think tank analysts in the months since the Iran war began, is that Mauritius’s sovereignty over the Chagos Islands, even with the UK lease arrangement, creates a vulnerability that China could exploit over time. Not through military action, but through the patient accumulation of political influence over a small island state that would gradually gain leverage over the lease terms, the base’s operational parameters, and the intelligence and communications infrastructure on the island.
Diego Garcia hosts some of the most sensitive signals intelligence and satellite communications infrastructure in the US military’s global architecture. The electromagnetic spectrum satellite used for communications is specifically mentioned in the UK-Mauritius deal’s provisions, because control of it matters enormously for military operations across the Middle East and Indo-Pacific. The idea that a government with close ties to Beijing would eventually have nominal sovereignty over the territory hosting that infrastructure is something Washington’s security establishment finds genuinely alarming, regardless of what any lease agreement says about operational control.
The case was made starkly by Senator John Kennedy in May 2026: the US must keep the military base out of Chinese hands. The framing is deliberate and it is not about Mauritius. It is about what Mauritius’s relationship with China means for the long-term security of an installation that the Iran war has just reminded everyone is indispensable.