
The rules of the game, and of the world, have changed. Old enemies now yield to glasnost and perestroika. The killing shadows of the Cold War are flooded with light. The future is unfathomable. The Berlin Wall is toppled, the Iron Curtain swept aside. The Secret Pilgrim is Ned, a decent, loyal soldier of the Cold War, who has been in British Intelligence all his adult life. Now, approaching the end of his career, he is forced by the explosions of change to revisit his secret years. He illuminates the brave past and even braver present of George Smiley, his hero and mentor, who gives back to him the dangerous edge of memory that empowers him finally to frame the questions that have haunted him - and the world - for thirty years...—LibraryThing To train new spies for this uncertain future, one must show them the past. Enter the man called Ned, the loyal and shrewd veteran of the Circus. With the inspiration of his inscrutable mentor George Smiley, Ned thrills all as he recounts forty exhilarating years of Cold War espionage across Europe and the Far East—an electrifying, clandestine tour of honorable old knights and notorious traitors, triumph and failure, passion and hate, suspicion, sudden death, and old secrets that haunt us still. —amazon
It catches Le Carre at the precise moment when the final scales fell away from his eyes, and he found himself unable to defend even partially the corporatist state that his characters had inhabited and defended at such personal moral cost for the better part of half a century.
Edit: Lol, apparently this precise article was posted in 2016...when I posted this precise comment: https://news.ycombinator.com/item?id=10862489
It's a sequence of vignettes about the Service as related by Smiley during a training session for new recruits. I remember finishing the book, and feeling a profound sense of pity for the broken, fractured people working for MI6.
A lot of Le Carre's stuff deals with the same themes -- but that was the first time I ever felt what the author was trying to put across. I've not read anything with similar impact since.
The belief about "western capitalism first strike" was one of the major fuels for the paranoia spiral involved in soviet foreign affairs, combined with experiences starting from western support of "Whites" during revolution, through the rather belligerent actions (especially from USA) once Truman was POTUS (and well, all of Truman doctrine and its long-term effects). A non-trivial issue that shows up from reading as stuff becomes declassified is how both sides constantly misunderstood each other, leading to (in hindsight idiotic) situation where initial ideas about disarmament on Soviet side turn into Berlin airlift. Meanwhile Austrian politicians figure out how to get everyone to leave by making the country neutral. It also didn't help that in Poland we probably didn't finish burying our dead in Warsaw when USA drawn up plans to nuke it as part of nuclear first strike on USSR, plans that I have little doubt were heard in Moscow, further fueling the spiral of cold war.
So the end result is a paranoid regime (and from paranoid to controlling there isn't even a step, it's a blink) that, even when some forces try to reduce said paranoia, they stumble upon evidence that it's warranted, resulting in nobody willing to back off (on USA side, you can probably shift some proportions and replace paranoiacs with "communism must die!" die hard ideologists). In the end it's not even one side playing checkers while the other plays chess - it's two sides playing long-distance play-by-mail chess where they delegate their moves to be done by a pigeon[1].
As for propaganda - consider that both sides, to a certain extent, bought into their own propaganda, sometimes even those that should know that a specific aspect of it was false (like JFK strong arming USSR to take missiles out of Cuba, instead of admitting that the missiles were taken away in exchange for removal of the reason they were placed there - which was USA placing missiles in Turkey).
As much as the books are fiction, John Le Carre summarised it pretty well in The Secret Pilgrim although from the western PoV (but similar take could be probably pretty much taken about soviets on the average):
Smiley muses that the most vulgar thing about the Cold War was that the Western societies learned to "gobble up [their] own propaganda." The West became so convinced of the righteousness of its own cause, and the evil of the Soviets', that it never stopped to examine the ethics of its actions. In the name of expediency, the Circus opened its arms – and its purse – to every petty thug and two-bit con man who called himself an anti-Communist.
[1] Referencing a polish idiom about playing chess with pigeon - not only does it not know how to play, it will push the pieces away and shit on the board.