Roskomnadzor, Russia’s federal censorship agency, wrote to the owners of 10 VPN services in late March to request compliance with the agency’s blacklist of websites that are blocked on Russian territory. Roskomnadzor threatened to block services that refused within the second half of May, and most of the VPN companies involved have already said they will not work with the agency. One of the companies on Roskomnadzor’s list is OpenVPN Inc., which has both its own paid VPN service and a VPN protocol that companies all over the world use to enable encrypted connections among devices. Meduza has learned that blocking that protocol might lead to broader disruptions in third-party services, somewhat like the agency’s efforts to block the messaging service Telegram in 2018. If Russian censors enforce their VPN blockage plan to the letter, areas from the banking system to the cellular service industry could experience unexpected technical issues.