From today through June 6th, Mail.ru will be running a demo version of Lost Ark in preparation for launch in Russia, presumably later this summer. The full game will not be available during the demo period, but it should give players a good taste of gameplay.
Players will need to register a Lost Ark account with Mail.ru and it appears that it will be region locked to Russia and "neighboring countries". The demo size is 27Gb and the downloader can be accessed once an account is created. Whether or not a VPN will suffice for registration and download remains unknown.