Ukrainian officials say they anticipate Russian cyberattacks in conjunction with potential missile strikes on electrical facilities

China's certainly watching Russia's missteps in cyberspace, as well as the U.S. response.

Critics said claims of a combined cyber and battlefield attack against a Ukrainian nuclear power plant are particularly irresponsible.

The references the NATO declaration makes to cybersecurity depart from the past and reflect the increasing importance of cyberdefense to overall security, experts said.

Cyber Command Executive Director Dave Frederick emphasized that Cyber Command relies on the private sector for intelligence and said he hopes more companies will report cyber incidents.

Russia want to control the internet in occupied Ukraine to feed the population disinformation — and to prevent Ukrainians from sharing video of Russian troops with Ukrainian soldiers, one expert said.