Translations are provided by fans (we simply do not know russian ourselves, so we can't do it), and it requires a small group as there is a LOT to translate... if some russian fans are up for it, they are free to try.

Okay, a lot of people have asked similar questions, and I'm sorry but the answer is 'no.'

As for the reasons, I've actually explained this many times before:

1. No one on the team is familiar with this new language, so we can't guarantee the quality of the translation.
2. The game currently has close to 500k English words, and it's still being updated—that number will only keep growing. It's a massive amount of work.
3. If we add support for a new language, we would need to maintain and update it continuously for years to come. That's really challenging, because people's enthusiasm naturally fades over time.
4. The way Ren'Py handles translations means that if a single line of English text is modified, the corresponding translations in other languages become invalid. To put it simply, if I fix a typo in an English line, I have to re-export the Chinese and Japanese translations and re-translate the affected sentences one by one. Supporting more languages would mean even more workload, and my energy is limited.

So for now, I really don't plan to consider adding support for any new languages.