Director Mykola Yeriomin had chosen not to finish that film, but restored it in 2012, emphasizing that it was and is unfinished.
Airsoft gun seen in this movie was later broken and this film is the only way to see how it functioned.
Mikhail Bondarev was scheduled to portray a small role as an assassination victim, but scene was never filmed. Despite that fact, Bondarev is credited in restored version's end credits, because it doesn't contradict one of the main themes of the film - being generally unfinished.
Film was made by Mykola Yeriomin in a period of serious depression. According to him film was made as a result of reflexion.
Was restored in 2012, on the 8th of April. The whole score was written on the same day.