Man, you must have been living under a rock for past month. All these statements about Russian military were claimed for few decades on general level, and they seemed to match reality when small conflicts were happening.
Then Ukraine happened and basically none of the predicted capacities and skills 'actively maintained' of russian military were displayed when facing actual equipped and trained army.
You disregard completely utter corruption, thievery and incompetence on all levels including top of power pyramid. I have 0 doubts that Russians have working nukes of various loads and range. I am very positive that number of usable ones is somewhere in 1-5% range and its often not immediately clear which are which.
If there was any maintenance to be done, rest assured it was skimmed and funds stolen. If any replacement should have happened, it was stolen too. Few nukes got probably stolen themselves. That's how state works for a long time, that's how Volodya keeps all bloodthirsty underlings happy, and these are side effects.