I don't speak Russian myself, but there's some Russian people in the Keeperklan discord that say the official voice acting has horrible translations that don't make any sense. And that the set that replaced it is an improvement. I had a long alpha period for people to try the new Russian voices, and nobody complained. However, if you say stuff is wrong with the new voices, I'd love to hear it.
Also, if you just prefer the old voice as a personal preference, it's possible to take the russian speech file from an older version.
EDIT:
Find the original speeches here: https://keeperklan.com/downloads.php?do=file&id=144