Why do websites with a .ru domain stop opening when a VPN is enabled?

RUSSIAN WEBSITES BLOCK TRAFFIC ORIGINATING FROM FOREIGN DATA CENTERS.

Many government portals, services, and banks block access for users with foreign IP addresses to protect against external DDoS attacks. When a foreign tunnel is enabled, access to the .ru zone is often blocked by the website itself.

Server-Side Geo-Blocking

Owners of Russian web resources configure traffic filtering by geographic region (GeoIP) and cut off public hosting and data center ranges. When a request comes from a foreign node, the website's firewall instantly drops the TCP connection or returns a 403 Forbidden error.

How to Set Up Access to Local Resources

Enable Split Tunneling and exclude .ru domains from routing
Use separate servers with Russian IP addresses for working with local portals
Configure automatic traffic redirection rules based on domain lists in your client