Alex Konanykhin, a Russian expat who founded TransparentBusiness, said he wants the Russian president arrested as a war criminal over the invasion of Ukraine.
CISA said the breach of SolarWinds network software that's compromised several federal agencies also poses a "grave risk" to state and local governments.
An executive at the cybersecurity firm CrowdStrike said a recent spike of incidents points to increased activity by a hacker group it calls Wizard Spider.