@stoprudnov To change language in the FAF client:
click hamburger button at top-left (explanation for what is a hamburger button: https://en.wikipedia.org/wiki/Hamburger_button)
click "Settings"
click "Language"
select Russian
To change language in the game itself:
while the game is running, click the circle button at the top of the screen
click "Options"
click "Interface"
click "Language"
select "RU"
