Our Russian players are prone to experiencing errors such as Backend Error on loading in to the Mourningstar, as a result of Roskomnadzor restrictions, which have been known to block access to Darktide's servers.
We understand some of our Russian players have to use services like VPNs in order to access Darktide.
For more information, please see our post dedicated to this issue on the Fatshark Forum:
KNOWN ISSUE: Error Loading in to Mourningstar for Players Based in Russia