Iran Launches IRBM Missile at Diego Garcia — 4,000km Attack Challenges US

Defence affairs - Def-Geopolitics

The launch of a medium-range ballistic missile towards the US-UK base in Diego Garcia suggests that the actual range of the Khorramshahr system may be further than announced, thus expanding the conflict into the Indian Ocean.

Iran's launch of two medium-range ballistic missiles toward Diego Garcia marks a strategic escalation that expands the operational space of the US-Israel-Iran conflict beyond the Middle East into the central Indian Ocean, challenging long-held assumptions about the geographic limits of Tehran's missile deterrence doctrine.

According to several US officials, the missile was launched towards a joint US-UK military facility in the Chagos Islands, a critical logistics hub that supports the deployment of long-range bombers, nuclear submarine operations and a fleet of guided missile destroyers, making the attack a strategic signal to the allies' military posture.

Officials also said that one missile was destroyed in flight while a US Navy destroyer launched an SM-3 interceptor against the second missile, but it was not yet clear whether the interception was successful or whether the missile failed on its own, raising questions about the effectiveness of missile defense protection in the Indian Ocean region.

US authorities assess that the missile is likely from the Khorramshahr-class family of medium-range ballistic missiles, a liquid-fueled system that Iran claims has a range of around 2,000 kilometers but is now suspected of being used in a configuration capable of nearly double that range through reduced payload and modified flight profiles.

The attempted attack came around day 22 of the latest cycle of escalation in the US-Israel-Iran confrontation, reinforcing the view among defense planners that Tehran is prepared to expand the range of its missile strikes to threaten strategic bases in the rear areas that support Western operations, not just regional targets in the Persian Gulf.

Diego Garcia's estimated distance of between 3,800 and 4,000 kilometres from Iran makes the launch very significant from an operational perspective as it indicates the possibility of using a lighter warhead of around 300 to 500 kilograms or the use of a previously undisclosed extended range variant, thus showing a deliberate demonstration of long-range capability.