Hello @lenwtet, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/4190#issuecomment-705757569.
LC_ALL=ru_RU.UTF-8 %command%x1 2020-10
Compatibility Report
System Information
I confirm:
Symptoms
Russian input does not work in proton. I tried to launch with options > LC_ALL=ru_RU.UTF-8 %command% < but nothing has happened. If I run this game on wine via > LC_ALL=ru_RU.UTF-8 wine "Among Us.exe" < It's works fine.