Then how many floating dry docks smack into warships in ,let say, USA ? their Navy is bigger, so if it is normal,we should have 3 or 4 such accidents there.
Maybe part of power-struggling for power ? in soviet times KGB blowed up their battleship/taken from Italy after WW2/ to undermine Malenkow.
Maybe Putin really is ill,and would-be-putins are using old soviet tactic ?