Overview
- The Financial Times published an investigation on Sept. 1–2 that says a multiyear, secret programme called C430L involved Russian specialists helping Iran develop supersonic cruise-missile technology.
- Reporting says the effort focused on a ramjet air‑breathing engine that can sustain high supersonic speeds and that the work was coordinated by Rosoboronexport with Russia’s NPO Mashinostroyenia.
- Leaked correspondence, travel logs and patent analysis cited by the FT document repeated Russian engineer visits to Iran from 2023 through 2026 and exchanges of test data and technical questions.
- The evidence shows Iran has built and flight‑tested a ramjet prototype but does not provide public confirmation that a Russian-assisted supersonic cruise missile has been deployed or entered service.
- Analysts say the transfer would be strategically significant because ramjet-powered, low‑altitude supersonic missiles shorten detection and interception time for ships and would likely need high-level Russian clearance, fitting a broader pattern of deepening Russia–Iran military ties.