I’m no epert but this article seems to contradict the author’s.
In the last two years, Russia’s second-biggest fleet, the Pacific Fleet, has been receiving new ships for the first time since the collapse of the Soviet Union. In 2013 the fleet obtained a new Borei-class nuclear-powered ballistic missile submarines (SSBN), and is expecting five more over the next decade. The fleet has furthermore received one Dyugon-class landing craft in 2014. This modernization campaign is part of an ambitious naval re-armament program over the next 20 years
http://thediplomat.com/2015/03/what-to-expect-from-russias-pacific-fleet-in-2015/
‘In 2013 the fleet obtained a new Borei-class nuclear-powered ballistic missile submarines (SSBN), and is expecting five more over the next decade. ‘
In 1970s Soviet Navy commissioned a new nuclear sub every several weeks. Current development surely doesn’t look like any massive build up.