Some of the first evidence of the scale of the cyber conflict going on over Ukraine appears in this release from Microsoft. The key lines are:

“Before the Russian invasion, our teams began working around the clock to help organizations in Ukraine, including government agencies, defend against an onslaught of cyberwarfare that has escalated since the invasion began and has continued relentlessly.”

“Since then, we have observed nearly all of Russia’s nation-state actors engaged in the ongoing full-scale offensive against Ukraine’s government and critical infrastructure, and we continue to work closely with government and organizations of all kinds in Ukraine to help them defend against this onslaught. “

Full statement here:

https://blogs.microsoft.com/on-the-issues/2022/04/07/cyberattacks-ukraine-strontium-russia/