The Blok 2BL was a
rocket 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 ...
, a member of
Blok L family, used as an upper stage on some versions of the
Molniya-M
The Molniya-M (, GRAU index: 8K78M) was a Soviet and Russian launch vehicle derived from the R-7 Semyorka Intercontinental ballistic missile (ICBM).
The original 8K78 booster had been the product of a rushed development program and its launc ...
carrier rocket
A launch vehicle is typically a rocket-powered vehicle designed to carry a payload (a crewed spacecraft or satellites) from Earth's surface or lower atmosphere to outer space. The most common form is the ballistic missile-shaped multistag ...
. It was used as a fourth stage to launch the
Oko
OKO (, obsolete Russian word for eye, also an abbreviation for Ob'yedinonnyye Kristallom Osnovaniya (, literal meaning Foundations Bound by a Crystal)) is a complex of two skyscrapers located on plot 16 in the Moscow International Business Cen ...
missile early warning defence spacecraft.
References
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