@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"

The official client? Yes the FaF client that you download of faforever.com

So, I don't know what exactly fixed it, but I installed a lot of games, and it stopped.

User rights got super crazed, prevented me from changing them (even as an admin).
Removed entire FAF folder, reinstalled the client, restarted PC and the problem got resolved.
Thanks!

For testing purpose, disable any security software/firewall. I would guess the firewall is interfering with the patched files, when it has worked before.

I think it is flag of Cyprus? Not sure about that, hard to see in the image.

Can you attach the last game log as well?

Also make a screenshot of said error which happened when you try via steam.

Security software is probably blocking it

@magge ok, i will

You need to do as Rama stated - launch the game directly once. That is the temporarily fix to this issue.

We found the cause of this issue, but no definitive solution yet.

i used restore point
all is ok

@sheikah achievements don't work, I agree. but everyone's statistics work fine.

Here is the full log file:

game_18496355.log

Thanks!

@magge yea thats the one. i read through that link thanks, so basically there's nothing i can do about it. ok