If you have a RU account you will be greeted
Editing to clarify my use of "region locked" may have one thinking that they are limiting CIS players to CIS regions. That is not the case. They are limiting the accounts by requiring them to be logged into from a CIS IP. If you are a CIS player you can play on EU like normal. If you are someone who purchased a CIS copy of the game because it is cheaper then normally you put on a VPN and login then disconnect and play. This no longer works. You now have to connected to your VPN the whole time, you may disconnect while loading into a raid but you will be kicked immediately after the raid is over.
Source: https://www.reddit.com/r/EscapefromTarkov/comments/17rb8lp/news_bsg_have_region_locked_cis_accounts/