A medium-range ballistic missile attack on an island south of Sri Lanka

Yesterday (21), Iran launched an attack targeting the joint military base belonging to the United Kingdom and the United States, located in Diego Garcia, part of the Chagos Archipelago, south of Sri Lanka in the Indian Ocean, with two Intermediate-Range Ballistic Missiles (IRBMs). However, international media reports indicate that neither of these missiles reached its target, with one malfunctioning and crashing during its flight.

The other missile was reportedly successfully destroyed by a US Navy warship using an SM-3 anti-ballistic missile system. Therefore, no damage or casualties have been reported at the base.

The immediate cause of this attack was the expansion by British Prime Minister Keir Starmer's government of the permission granted to the United States to access bases, including Diego Garcia and RAF Akrotiri in Cyprus, to launch limited defensive operations against Iranian missile sites threatening maritime traffic in the Strait of Hormuz. This decision had been made after a previous Iranian drone attack on Akrotiri base, leading Iranian Foreign Minister Abbas Araghchi to warn that British lives were at risk. This can be seen as another escalation in the 2026 Iran War situation, created by crises in the Strait of Hormuz, through which about 20% of the global oil supply passes, and US-Israeli attacks on Iran since late February.

Iran's state media, Mehr News Agency, and authorities have stated that through this attack, Iran has clearly demonstrated its long-range strike capabilities to the world. Although Iran had previously declared that it limited the maximum range of its missiles to 2,000 kilometers to show they were not a threat to other countries, this attack on Diego Garcia, located between 2,360 and 4,000 kilometers away, has proven that these limitations are no longer valid. Accordingly, it has been confirmed that Iran now has the capability to easily attack major European capitals, which has caused significant attention and concern in Western countries.

Diego Garcia is the largest island in the Chagos Archipelago, a British Overseas Territory located in the middle of the Indian Ocean, and is also referred to by the US Navy as the "Footprint of Freedom." Operational since the 1970s, this base accommodates heavy bombers such as B-52, B-2, and B-1, and features aircraft hangars, a deep-water port for warships and submarines, large fuel storage facilities, radar installations, and satellite communication networks. It provides accommodation for approximately 2,500 American and British military personnel. Since the 1991 Gulf War, through operations in Afghanistan, Iraq, and Yemen, it has served as a critical hub for projecting American power across the Middle East, South Asia, and the Indo-Pacific region.

The history of this base is marked by numerous controversial events, and the forced displacement of its indigenous Chagossian people by Britain in the 1960s and 1970s to build the base for US military use remains a matter of legal and ethical debate. However, according to the latest agreement reached between the United Kingdom and Mauritius in 2025, although sovereignty over the island has been transferred to Mauritius, the United Kingdom has been granted a 99-year lease to continue operating the base, with strong support from the United States.

British Foreign Secretary Yvette Cooper strongly condemned this missile attack as a threat to the interests of the United Kingdom and its allies, as well as an irresponsible act. She further emphasized that the British government only supports defensive measures and that their aspiration is to de-escalate tensions in the region. However, the opposition has accused the government of dragging Britain into a war. Meanwhile, following this incident, which could be recorded as the longest anti-missile engagement in American history, the international community is closely monitoring the new threat to Europe, potential disruptions to global maritime traffic, breakdowns in international supply chains, and rising oil prices.