The following is the Aug. 5, 2018 Congressional Research Service report, Russia’s Nuclear Weapons: Doctrine, Forces, and Modernization.
From the report
Russia’s nuclear forces consist of both long-range, strategic systems – including intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and heavy bombers – and shorter- and medium-range delivery systems. Russia is modernizing its nuclear forces, replacing Soviet-era systems with new missiles, submarines and...
https://news.usni.org/2019/08/13/report-to-congress-on-russian-nuclear-weapons