Ukraine has banned military personnel, high-ranking state officials, and employees of defence companies and key infrastructure facilities from installing or using the messaging service Telegram on official devices. The decision was made by the Coordination Centre for Cybersecurity of the National Security and Defence Council, a statement from the Ukrainian parliament said on Friday. Individuals whose tasks involve communication via Telegram are exempt from the regulation. According to Andriy Kovalenko, head of the Centre for Countering Disinformation at the National Security and Defence Counci…