On December 12, 2015 the Verkhoturie submarine of the Project 667BDRM/Delta IV class successfully launched an R-29RM Sineva missile from Barents Sea. All warheads are said to have successfully reached their targets at the Kura test site in Kamchatka.
Previous R-29RM launch took place in October 2015, from the Bryansk submarine. For Verkhoturie it's the first launch since December 2012, when it returned from an overhaul that included installation of the Sineva version of the R-29RM missile.
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What is Layner 2 missile? This thing is said to be capable of delivering 12 low-yield warheads.