To connect to a Valorant server located in Europe when traveling to another region, follow these steps:
Sign up for a credible VPN service like VeePN.
Download and install the VeePN app on your device.
Connect to the best VPN server for Valorant, be it in Stockholm, London, Paris, Madrid, or else.
Turn your VPN on and head to the Riot Games launcher.
Log in to your Riot account to play the game.
For more information, read this blog post.