Hi,
First make sure you are on the RU server or EU server.
If you talk about public games, the server are merged. So we alle play together.
3 ways to know if you are connecting to EU or RU server.
1) If you start the launcher the image are in Russian
2) When you start the game and you pressed play in the launcher you get the logon page. If you have 2 icon below the logon button = EU, 3 icons = RU
3) Ingame chat, if the channel are EU locations then your on EU, if they have multiple Russian channels you are on RU.