As fears of Russian military action against Ukraine rise, the U.S. government is urging cyber readiness at the nation's critical infrastructure operators.

Russian military intelligence has conducted a coordinated hacking campaign against hundreds of targets worldwide, according to a U.S. agency advisory.

The U.S. remains vulnerable to cyberattacks from both state actors and criminals acting with foreign governments' blessings, participants warned in a webinar.

Panelists from the FBI and E-ISAC warned on Tuesday that insider threats represent a much broader category than many utilities are prepared to deal with.