I've never heard anyone in a real leadership position in Russia make much mention of the use of nuclear weapons at all,
I'm somewhat surprised that neither Russian State media or any of your conspiracy youtubers have discussed the nuclear threats Medvedev has made. He does it all the time.
Nobody here in Russia takes Medvedev seriously. It seems that after the death of Zhirinovsky, he occupied the niche of an outrageous freak in the political arena. In short, an ordinary clown like Zelensky.