Derivatives
Several remaining SS-18 missiles have been modified for surface launch and now carry lightweight satellites to Low Earth Orbit (LEO), including many foreign payloads.
The Tsyklon-2 was able to carry 2,820 kg into LEO and the Tsyklon-3 could carry 4,100 kg to LEO. They were retired in 2006 and 2009 respectively.
The Dnepr-1 launch system can carry 4,500 kg to LEO. 150 SS-18 missiles are available for Dnepr conversion until 2020.
Read more about this topic: R-36 (missile)