Russia also has 12,000 main battle tanks of which around 3,000 are functional. A far worse ratio will apply to their nuclear weapons which require frequent and very costly maintainence.
It also doesn’t help that, so far as I can tell, Russia has not produced or reprocessed a nuclear weapon since 2017 when their Mayak facility suffered a nuclear accident and was destroyed.
I can give you 10:1 odds, no country is suicidal enough to nuke Russia. May be except Iran. But Putin gets along with Iran. May be if Zelensky had a nuke he would bomb Moscow. May be Biden will give Zelensky a couple of nukes. Biden ensures a win in 2024 by staring a war with a Russia.