Can someone explain The Secret Agent's Blunder / Oshibka rezidenta?

Can someone explain The Secret Agent's Blunder / Oshibka rezidenta? - Concrete House on Mountain

I watched this Russian film, The Secret Agent's Blunder (1968), with English subtitles, but I found it hard to distinguish between the different characters. Thus, I still don't really understand what was going on. I can't find much in the way of summaries, synopses, or explanations about it.

Does anyone have a good explanation for what went on, or maybe even an explanation of the characters?






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