It is not the ones in power that actually launch the nukes. It is normal military personnel.

Several times since WW2 the USSR/Rus military have had orders to launch nukes and the people on the ground have refused to do so.

Once during the cuban missle crisis. (USSR)

Another during post soviet times.

This vid lists the incidents I am talking about.

So I am actually not worried about nukes at all.

First off: Putin and those in power know the use of nukes means they (and their cushy oligarch lives) are gone.

Second: I doubt their orders, if ever given, will be carried out.

TLDR: Due the the certainty of massive retaliation nukes will never be used.