This is in progress. I might remove games or add them as I check how much actual spoken lines are there. Let me know if you think a game in the list doesn't have so much actual voiceover to be included. Many audio tags in the GOG cards are clearly fake and present for games that barely have a few spoken words in it.
Games that have to be modded to have Russian dub are not included. The game must be sold with Russian dub as is on GOG. If you think a game belongs to this list please comment and let me know.
note to self: keep adding 1C Entertainment

https://docs.google.com/spreadsheets/d/10TvUJZz-QqS2sj7X9oqz02ENhEUfMYS3y3Ix8_MNCYI/edit?usp=sharing

games with German dub
https://www.gog.com/forum/general/games_with_russian_dub_1

games with Japanese dub
https://www.gog.com/forum/general/games_that_have_japanese_dub

Sorry for the necro, but Selfloss (coming soon) lists Russian dub in the product information:
https://www.gog.com/game/selfloss

Also, if someone makes a "games made in Russia" post, the dev of the game appears to be from there.
Or at least the bio in his Twitter profile says he's from St. Petersburg (Russian port town):
https://twitter.com/alexgoodwindev

She Sees Red has a wonderful Russian audio (although it's not a dub, but the original one)

I'm almost sure there's also a Made in Russia thread in the Russian forums, if you want to check there for games originally from that country.

The Metro games:
https://www.gog.com/game/metro_2033_redux
https://www.gog.com/game/metro_last_light_redux
https://www.gog.com/game/metro_exodus

absolutely not necroing, this list is always ongoing
thank you
I add games as they are actually released, so coming soons will have to wait
thank you! thank you, how could I overlook She Sees Red, I can't wait for my Russian to be decent enough to dare play it. I use tthe word dub but I list any game that consistently is spoken (not just a few words possible). I don't care for what is "original" or not.
also, I apologize for the late reply but this forum notification system and I don't go well together thank you, added! :) Also added to the German list. Funny how I had added Metro Exodus to the Japanese dub list and then stopped there. I must have been falling asleep or something like that!