Block 2BL
Encyclopedia
The Blok 2BL is a rocket stage, used as an upper stage on the some versions of the Molniya-M
Molniya-M
The Molniya-M , designation 8K78M, was a Russian carrier rocket derived from the R-7 Semyorka ICBM. First launched in 1964, it had replaced its predecessor, Molniya, by the end of 1965...

 carrier rocket. It is used when the rocket was flown in the configuration used to launch Oko missile early warning defence spacecraft.
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