'Depressed' Vladimir Putin is 'set to hold a nuclear evacuation drill' with the Kremlin's doomsday plane after moving his family to a 'secret underground city' in Siberia, 'insider' account claims Questions have been raised over health and mental state of Russia's president Fears of nuclear conflict increased when he threatened NATO with 'consequences' if it intervened in the war, and put his nuclear forces on standby Now, a source has claimed he has told his close allies to prepare for nuclear drills An element of Russian plans for a nuclear war are a fleet of 'flying Kremlins' The doomsday planes...