(Watched the great film 'The Death of Stalin' & immediately bought & began reading this book)
Although Stalin had deployed the full resources of his empire to protect himself, all these precautions served only to enhance his vulnerability.
When he collapsed, his security arrangements made it harder for his staff to know what was going on, to assist him, to summon help.
His chauffeur took different routes between the Kremlin and the dacha.
His motorcade of five identical limousines, none with license plates, made its way over the twelve-mile route from the Kremlin to the dacha with the drivers passing one another to deter any would-be assassin.
Hundreds of agents patrolled the dacha grounds with German shepherds.
There were multiple locks on the gate and double rows of barbed wire around the compound, along with bodyguards among the household staff.
None of these layers of security could prevent him from lying for hours [after he got a stroke] in his own urine, paralyzed, and without the ability to scream.
'The Last Days of Stalin' by Joshua Rubenstein
https://www.amazon.com/dp/B01F5NGDIO