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... Russian intelligence groups may try to identify and recruit defense industrial base "insiders," the agencies said. That includes outside individuals eliciting information from staff or unusual loitering by unauthorized personnel, they said.

"US companies, particularly those supporting entities involved in the Ukraine conflict or other ongoing geopolitical conflicts, as a best practice should enhance their vigilance and security efforts," the National Counterintelligence and Security Center, the Federal Bureau of Investigation and several Department of Defense agencies said in a joint bulletin.

The warning highlights rising concerns around evidence that Russian intelligence services may be employing increasingly aggressive tactics and recruiting criminals, and may have been behind a string of arson, cyber and other attacks across Europe in recent months.

"Russia's sabotage activities in Europe increase the risk to US companies abroad and potentially at home," the agencies said.

President Joe Biden's outgoing administration has warned allies about the risks of stepped-up Russian sabotage if the US and its allies allowed Kyiv to fire western weapons deep inside Russia. ...