On 1 October 1939, Winston Churchill, First Lord of the Admiralty and soon to be the UK's wartime leader, described Russia as 'a riddle wrapped in a mystery inside an enigma'. The same can certainly be said of Stalin. How can this paradox of a man, who on the one hand had once exhibited great tenderness and kindness to his daughter Svetlana, and on the other sent millions - including members of his own family - to their deaths, be explained?
It...