Overview
- Financial Times reporting based on leaked Russian documents says a covert programme called C430L began in 2023 and involved Rosoboronexport coordinating with NPO Mashinostroyenia to transfer technical know‑how to Iran.
- The work focused on ramjet engines, a type of air‑breathing propulsion that lets cruise missiles sustain supersonic speeds at low altitude and shortens radar detection and interception windows.
- Leaked travel records and exchanges show Russian specialists reviewed Iranian flight‑test data, raised detailed technical questions and discussed a next phase of cooperation that extended into mid‑2026.
- Iran has reportedly built and flight‑tested a ramjet prototype, but there is no independent confirmation that a Russian‑assisted supersonic cruise missile has been completed or deployed.
- Analysts say the transfer, if accurate, would deepen Russia–Iran military ties and could raise the risk to U.S. and allied ships in the Gulf, yet the account rests on leaked materials and key details remain unverified.