KGB - Walkthrough part 4

KGB is an adventure video game developed by Cryo Interactive Entertainment and released in 1992 by Virgin Entertainment, on PC and Amiga.
It puts you in the shoes of Maksim Rukov, a KGB agent investigating a case which seems trivial at first, but eventually turns out to be a conspiracy of huge proportions.
This is a difficult game, and you can expect to fail in your mission a lot when you play it for the first time. However, you are almost always told where you failed exactly, so a persistent adventure gamer will be able to solve it on his own.
This is a "playthrough" as well a "walkthrough" because I show you a few optional things as well, even though these videos will show you how to beat the game. There are several more optional things you can do, which I did not include for brevity's sake.