https://www.techradar.com/news/wi-fi-hotspots-in-world-cup-host-cities-unsafe

If you’re planning on visiting Russia during the World Cup, be careful what kind of information you’re sharing over the internet, because not all public Wi-Fi networks over there use traffic encryption.

This is according to Kaspersky Lab, whose research of roughly 32,000 public Wi-Fi networks in World Cup 2018 host cities suggests that a significant part is unsafe.