The R-36M was an evolution of the original Soviet heavy ICBM, the R-36.
The development of the missile began in 1969, with the first test launch occurring in 1973.
The initial R-36M variant entered operational service in 1974. This weapon was available in two configurations, a single warhead missile and a missile with 8 MIRVs each of 550 kiloton yield.
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