Honestly I doubt that Russia has maintained their arsenal. Nuclear warheads must be maintained because the fissile cores wear out due to the natural halflife of uranium. So after X number of years (super-dooper state secret stuff, but it's like every 10 years based on napkin math I did in my undergrad) the cores must be replaced.
All that said - I think Russia's nuclear program is likely not in a functional state. The rockets work. They'll do a publicized underground test every few years to show off capability. But something like nine in ten of their warheads will not reach criticality and misfire today if actually used. That's still not a fun scenario, tens of millions would die. But it's not nuclear apocalypse level that they use for defense posturing.