Hard to imagine - yes.
But unfortunately still possible, it takes just mistake or one gamble or something like that ...
Discussion
Russia, like the Soviet Union, treats the use of nuclear weapons with a fair degree of responsibility. I can’t recall a single case where they used them against human targets. And the conflict in Ukraine is still largely a PR-driven affair — it’s less significant than it seems, even within Russia, let alone in Europe.
I do agree to a some point. But as I said, it can be mistake or whatever. Risk is still there.