Recently, Escape from Tarkov and EFT Arena players from Russia began complaining about problems with server availability. Battlestate Games took notice of this.
The EFT developers acknowledged the problem and confirmed that they are working on restoring access:
We are aware that some players from the Russian Federation may be experiencing problems connecting to servers and logging into the game. These difficulties are related to the operation of network infrastructure beyond the control of Battlestate Games. We are already working on alternative solutions to restore access in the region and thank you for your patience.
At the same time, this problem did not affect all regions of the Russian Federation; some community members can still play EFT.