Among the Russian films with a strong political innuendo I've seen, "Welcome, no trespassing" was the sharpest and one of the most enjoyable. It's about a scout camp where the the director oppresses the children with stupid formal procedures, patriotic ceremonies, and abuses of power. I could not understand why this film was allowed, since the camp is an obvious metaphor of the USSR. I'm also surprised one of the mos…
Edit: The most clear example I can recall is the "Alexander Nevskiy" film (https://www.imdb.com/title/tt0029850/). It's a historical drama about the early Russia's struggle against foreign invasions. The titular character makes a Bible reference at one point ("Who will come at us with the sword will die by the sword" referencing Mat 26:52) but since it's not a direct quote, somebody censoring this would have to admit reading the Bible and would be in danger oneself. So the quote remained in the film and most people recognize the reference.