Distributed Denial of Service (DDoS) attacks and defacing or hijacking public websites or media are unlikely to have a substantial effect on cyber or physical operations for either government, although they may have effects on morale and public support. However, ransomware groups that have threatened support for Russia do have the capability to target organizations that provide essential infrastructure such utilities, banking, hospitals, etc. Organizations should be on heightened alert and make efforts to continue appropriate vulnerability management and tightened security controls, including a defense-in-depth strategy with a focus on post-exploitation activity.

https://therecord.media/russia-or-ukraine-hacking-groups-take-sides/

https://www.reuters.com/world/exclusive-ukraine-calls-hacker-underground-defend-against-russia-2022-02-24/