The Ikar was a rocket
upper stage
A multistage rocket or step rocket is a launch vehicle that uses two or more rocket ''stages'', each of which contains its own engines and propellant. A ''tandem'' or ''serial'' stage is mounted on top of another stage; a ''parallel'' stage is ...
designed in Russia in 1999 to be used with the
Soyuz 11A511U rocket as Soyuz-Ikar. It was derived from the propulsion module of the
Yantar spy satellite
A reconnaissance satellite or intelligence satellite (commonly, although unofficially, referred to as a spy satellite) is an Earth observation satellite or communications satellite deployed for military or intelligence applications.
The ...
s.
References
Expendable space launch systems
Rocket stages
Space launch vehicles of Russia
{{Rocket-stub