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The MR-UR-100 intercontinental ballistic missile capable of carrying up to 4 warheads was under development at KB Yuzhnoe design bureau in Dnepropetrovsk beginning in 1970. The test launches of the missile started in Baikonur in 1972. Total 40 launches (of them 7 unsuccessful), were conducted until 1975, when the missile was accepted into the armaments of the Soviet Strategic Missile Forces, RVSN.
The MR-UR-100 missile was decommissioned in 1983. The modified version of the missile, known as 15A16 or MR-UR-100UTTKh was under testing in Baikonur between 1977 and 1979. It remained in armaments until 1994.
Known specifications of the MR-UR-100 missile:
A test launch of the MR-UR-100 rocket. Credit: KB Yuzhnoe
The propulsion section of the MR-UR-100 missile. Copyright © 2001 by Anatoly Zak
RD-863 (15D167) steering engine used on the first stage of the MR-UR-100 missile. Copyright © 2001 by Anatoly Zak
The warhead of the MR-UR-100 rocket carried multiple individually targeted reentry vehicles, MIRVs. Credit: KB Yuzhnoe
Shown to the scale from left to right are MR-UR-100, RT-23 and R-36 missiles. Copyright © 2001 by Anatoly Zak
Scale model of the MR-UR-100UTTKh missile. Copyright © 2001 by Anatoly Zak