Why in news?
On 21 March 2026 media reports claimed that Iran had launched two intermediate‑range ballistic missiles towards Diego Garcia, a remote island hosting a joint US‑UK military base in the Indian Ocean. One missile allegedly failed and the other was intercepted by a US warship. Iran denied involvement, but the incident highlighted the strategic importance of the island.
Background
Diego Garcia is the largest island in the Chagos Archipelago, located about 3,800 km east of the African coast. The Portuguese encountered it in the early 16th century, and France settled it in the 18th century. Under the 1814 Treaty of Paris it became British territory. In 1965 Britain separated the Chagos islands from Mauritius to form the British Indian Ocean Territory (BIOT). Between 1967 and 1973 the indigenous Chagossians were forcibly removed to Mauritius and the Seychelles so that Britain and the United States could build a major military base.
Strategic and legal issues
- Geopolitical significance: The Diego Garcia base has a long runway and deep‑water port, allowing rapid deployment of bombers, surveillance aircraft and pre‑positioned ships across Asia, Africa and the Middle East. It has been used in conflicts from the Gulf War to operations in Afghanistan and Iraq.
- 2019 ICJ advisory opinion: In 2019 the International Court of Justice advised that the UK should end its administration of the Chagos Archipelago and complete decolonisation of Mauritius. The UN General Assembly adopted a resolution calling for the islands’ return.
- 2025 UK–Mauritius treaty: In May 2025 Britain and Mauritius reached an agreement whereby the UK recognised Mauritian sovereignty over the archipelago while leasing Diego Garcia back to the UK and US for 99 years. The treaty includes environmental protections and compensation for displaced Chagossians.
- Recent missile incident: Reports of ballistic missiles targeting the base underscored its vulnerability and Iran’s expanding missile range. The UK condemned the attack; Iran dismissed it as “fabricated”. The event stoked debate over the legality and security of the base.
Implications
The incident demonstrates how great‑power rivalry and unresolved colonial legacies intersect in the Indian Ocean. While the base remains vital for western security interests, moving towards decolonisation and addressing the rights of displaced Chagossians are equally important to achieve lasting legitimacy.
Sources: The Hindu
