Is Russia retreating in preparation for a nuclear scenario? In my opinion the only way to answer that would be to know the exact location of all their military

Is Russia retreating in preparation for a nuclear scenario? In my opinion the only way to answer that would be to know the exact location of all their military leaders and trusted oligarchs real-time. When a majority of them vanish into the bunkers that is when I would expect escalation. Based on what little I know of Russian military history they will do nothing to protect their troops or civilians but I am not a proper historian.