Overview
The Soyuz rocket family traces its lineage directly to the R-7 Semyorka — the world's first intercontinental ballistic missile, designed by Sergei Korolev's OKB-1 design bureau in the 1950s. Derivatives of the R-7 launched Sputnik (1957), carried Yuri Gagarin into orbit (1961, on a Vostok variant), and have been flying continuously ever since. The Soyuz variant specifically entered service in 1966, and counting all R-7 family members, the lineage has accumulated over 2,000 flights — an unmatched record in rocketry.
The current operational variant is the Soyuz-2 (in 2.1a, 2.1b and 2.1v sub-variants), which replaced the analogue flight control systems of earlier versions with a digital system, improving payload capacity and accuracy. Soyuz-2 rockets launch from Baikonur Cosmodrome (Kazakhstan), Plesetsk Cosmodrome (Russia) and Vostochny Cosmodrome (Russia's new Far East spaceport).
Specifications — Soyuz-2.1b
| Parameter | Value |
|---|---|
| Height | ~46 m (with Fregat upper stage) |
| Core diameter | 2.95 m |
| Liftoff mass | ~312,000 kg |
| Boosters | 4 × tapered strap-ons, each with 1 × RD-107A |
| Core stage engine | 1 × RD-108A |
| Third stage engine | 1 × RD-0124 |
| Optional upper stage | Fregat (restartable, for precise orbit insertion) |
| Propellant | LOX / kerosene (all stages) |
| Payload to LEO | ~8,200 kg (no upper stage) |
| Payload to SSO (600 km) | ~4,850 kg (with Fregat) |
| Reusable | No (fully expendable) |
The R-7 Family Tree
Understanding the Soyuz means understanding its place in the R-7 family — one of the longest-lived and most successful engineering lineages in history:
- R-7 / Sputnik (1957) — launched the first artificial satellite
- Vostok (1960) — carried the first human to space (Gagarin, 1961)
- Voskhod (1963) — carried the first multi-person crew and first spacewalk
- Soyuz (1966) — became the standard crew launcher for Salyut, Mir and ISS
- Molniya (1960) — placed communication satellites in highly elliptical orbits
- Soyuz-U (1973) — the single most-launched orbital rocket variant, with 786 flights
- Soyuz-FG (2001) — the crewed ISS transport variant until 2019
- Soyuz-2 (2004) — the current digital variant, now the sole operational Soyuz
Soyuz at Kourou — and Its Loss
From 2011 to 2022, Soyuz rockets also launched from the Guiana Space Centre in Kourou, French Guiana, operated by Arianespace under a partnership with Roscosmos. The equatorial launch site gave Soyuz a significant payload boost for GTO and Sun-synchronous missions. This partnership ended abruptly in February 2022 following Russia's invasion of Ukraine — Roscosmos recalled its personnel from Kourou, and the remaining Soyuz rockets at the site were left unused. The loss of Soyuz from Kourou left a gap in Europe's launch capability that was not filled until Ariane 6's maiden flight in mid-2024.
Current Operations
As of 2026, Soyuz-2 continues to fly from Russian spaceports, primarily carrying GLONASS navigation satellites, military payloads, Progress cargo spacecraft to the ISS, and Soyuz crewed spacecraft. Russia's annual Soyuz launch rate has decreased compared to peak years, partly due to the loss of commercial and ESA contracts and partly due to the geopolitical and economic impacts of sanctions. Russia has been developing the Angara A5 as a planned next-generation replacement for heavy-lift missions, though Soyuz-2 is expected to remain in service for years to come given its reliability and extensive infrastructure.
Reliability
The Soyuz family's overall reliability is approximately 97%, with the modern Soyuz-2 variants having an even higher success rate. The most notable recent failure was Soyuz MS-10 in October 2018, when a booster separation anomaly triggered an abort during ascent. The launch abort system performed flawlessly, pulling the crew capsule away safely — the crew of Aleksey Ovchinin and Nick Hague landed unharmed. The incident was a dramatic demonstration of the Soyuz crew escape system's robustness.