One of the three remaining Project 667BDR submarines, Ryazan, has returned to its base in Vilyuchinsk after an overhaul at the Zvezda plant in Vladivostok.

The submarine was transferred to the Pacific from the Northern Fleet in 2008. It began its overhaul in 2012 and its return to service was delayed a number of times.

Ryazan is an old submarine - it began service in 1982. It is not clear what is the reason submarines of this class are kept in service, but they seem to be doing reasonably well. Each submarine carries 16 R-29R missiles with three warheads, so the return of Ryazan will increase the New START warhead count.