The modernized version of the R-29RM (SS-N-23) missile, known as Sineva, has been officially accepted for service. This step formally completes the missile development process. The flight tests of the missile were completed several years ago (in 2004 or 2005) and it has been deployed on submarines of the Project 667BDRM (Delta IV) class that are currently undergoing overhaul. The missile was reported to carry new nuclear warheads.
UPDATE 12/27/07: According to a representative of the Makeyev Design Bureau, President Putin signed the decree on July 9, 2007.