One of the comments on part 1 confirm the theatre stage play angle:
"To the foreign people in the comments - It is a theater stage play recorded in the format of tv film. Such kind of format was popular in Soviet Union."
Yes, I can confirm that. It was a popular format in the 80s (cheaper to make, plenty of re-usable sets, etc), though by the time this was released it was on the way out.
Stage play, aye. (Score:5, Informative)
One of the comments on part 1 confirm the theatre stage play angle:
"To the foreign people in the comments - It is a theater stage play recorded in the format of tv film. Such kind of format was popular in Soviet Union."
Re:Stage play, aye. (Score:1)