“I’m getting an enormous number of very sophisticated LinkedIn requests from the same type of attractive young Chinese woman,” James Mulvenon, chief intelligence officer at risk-assessment firm Pamir Consulting, told The Times.

“It really seems to have ramped up recently.”

A former US counterintelligence official who now works for Silicon Valley startups told The Times that he recently investigated one case of a “beautiful” Russian woman who worked at a US-based aerospace company, where she met an American colleague whom she eventually married.