On December 17, 2007, the Russian Navy performed a successful test launch of a R-29RM
Sineva/SS-N-23 sea-launched ballistic missile. The missile was launched from a submerged submarine K-114 Tula of the Project 667BDRM/Delta IV class deployed at Barents Sea. The Navy reported that the warheads successfully reached their targets at the Kura test site in Kamchatka.
UPDATE 02/04/08: According to a report of the Makeyev Design Bureau, this was not a Sineva modification of the R-29RM. Rather, it was an old R-29RM missile, which was produced 18 years ago.