Cue to me to start reading his 'Age of Extremes: The Short Twentieth Century' which I've had for ages, unopened. He admits he is not specialist in this period. Perhaps he is unduly modest, but (knowing his left-leaning sympathies) hope it will not be unduly selective.
Unlike a book by Harpal Brar I've just read 'Revisionism and the Demise of the USSR', which is shamelessly partisan, blaming Kruschev's Peaceful Coexistence policy for the breakup of the USSR and mentioning nothing- absolutely nothing- about the abuses that went on. However, have to admit I found it interesting enough to read through immediately, and it is very clearly written.