|Place of origin||Russia|
|Used by||Russian Navy|
|Designer||Makeyev Rocket Design Bureau|
|Warhead||4 MIRV with a yield of 500 kiloton each or 10 MIRV with 100 kiloton yield|
|Engine||Three-stage liquid-propellant rocket|
|8,300 km (max range), longest distance ever reached with least payload is 11,547 km (7,174 miles) |
|Accuracy||250-500 meters |
The R-29RMU Sineva (Russian: Синева, lit. "blueness"), code RSM-54, is a Russian liquid-fueled submarine-launched ballistic missile with GRAU index 3M27, designation SS-N-23A Skiff. It can carry four warheads and is designed to be launched from Delta IV class submarines, which are armed with 16 missiles each. As of 2017, there are 96 launchers deployed on the submarines.
The first full-range test was reportedly conducted on October 11, 2008; the reported range was 11,547 kilometers (7,174 miles). The R-29RMU entered service in 2007 and is expected to remain in service until at least 2030.
Current plans call for the construction of approximately 100 such missiles.
At its height in 1984, the Soviet Navy conducted over 100 SSBN patrols. The Russian Navy declined during the 1990s, with no SSBN patrols carried out in 2001–2002. The development of the Sineva is part of a program tasked with "preventing the weakening of Russia's nuclear deterrent."
The R-29RMU Sineva is seen as a rival to the solid propellant Bulava SLBM. Originally, the Russian Navy was slated to receive the Sineva missile in 2002, but the first test was conducted only in 2004. The missile was eventually commissioned in 2007. The missile was reported to carry new nuclear warheads.
Failed Sineva test launches took place during the strategic command exercise “Security-2004” (held 10–18 February 2004), which also included the launch of a Molniya communication satellite and an R-36 missile. The launch failures involving nuclear submarines Novomoskovsk and Karelia may have been caused by a military satellite blocking the launch signal; this incident did not lead to any serious consequences for the K-407 Novomoskovsk strategic nuclear submarine. March 1, 2004 saw then Russian president Vladimir Putin instructing the acting defence minister to carry out an investigation in order to determine the reason of the launch failures of the three RSM-54 missiles in mid-February.
17 March 2004 saw Novomoskovsk nuclear submarine of the Russian Northern Fleet perform a successful launch of the RSM-54 Sineva. The missile’s two warheads reportedly hit their targets. President Vladimir Putin and Defense Minister Sergei Ivanov observed a successful test launch of the Sineva missile from the SSBN Yekaterinburg.
Further successful launches were conducted by K-84 Yekaterinburg on 8 September 2006. The missile was launched from an ice-covered polar region toward the Chizha test site at the Kanin Peninsula. The three warheads were reported to have successfully reached their targets.
Another successful launch was performed on 4 March 2010 from the Barents Sea. This was followed by more launches on 6 August 2010, when a K-114 Tula fired two missiles towards the Kura Test Range. Two more launches were carried out on 20 May 2011 and 27 July 2011, both successful.
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