Andrei Myagkov’s voice gives him away the moment he opens his mouth in this movie. I recognized him not by the way he looks, but by the way he talks. Same for Nikita Mikhalkov, though in his case I was expecting his appearance from what I read in the YouTube description. It wouldn’t have mattered. His voice gives him away.
It reminds me of how remarkable it was that Aleksandr Belyavsky could put on a such a different voice to play Leonid Brezhnev in Serye Volki.