Ok so I can finally reply to your question after days of appealing my permanent ban to noncredibledefense for my comment above. (Apparently it was too pro-russia and spreading false information)
Secondly you’re right, I don’t think anyone knows how many are truly functional, the US and Russia have the best ideas but both of those nations are rightfully very secretive about the true nature of the nukes.
I believe that if US truly believed the russian nuclear arsenal was a zero threat they would have already put troops in Ukraine. That’s mostly the reason why my opinion is that Russia has at least one likely operational nuclear device which could cause damage to the European continent.
Secondly risk is calculated by two factors, chance and effect.
As a European myself, the effect of russian nukes on Europe terrifies me because I live in a major city that would be a target if Russia ever went scorched earth. Although the chance is low the effect is high which puts the overall risk above zero which is too much especially with the majority of NATO residing in that continent.
Put the rose tinted glasses to one side. We still had harmful viruses back in the day, difference is these days you are storing more private information “online” so the effect of compromise is larger.