Security experts have observed an increase in the number of cyber attacks between the two countries. Cyber units on both sides may be actively engaged in online campaigns, in the recent weeks it has been observed the rise of DDoS attacks and cyber attack malware-based, according data provided by security firm FireEye. One of the most reliable ways to discover computer network operations is to look forcallbacks the communications initiated from compromised computers to an attackers first-stage command-and-control (C2) server.”]
Source: https://securityaffairs.co/wordpress/25369/intelligence/russia-and-ukraine-cyber-tension.html