GOOGLE admits taking cash unwittingly from Russian agents interfering in the US election.
The tech giant said tens of thousands of dollars were spent on adverts spreading disinformation.
Operatives targeted Google products including video-sharing site YouTube, Gmail, and the DoubleClick ad network.
But sources say the ads do not appear to be from those Russians recently revealed to have bought thousands on Facebook.
Digital research expert Jonathan Albright said the latest revelations showed how skilled the Russians were at manipulating the tech giants.
He said: “It’s social media marketing at an expert level. This is very well executed.”
Last month Facebook shared with US investigators 3,000 ads from the Kremlin-affiliated Internet Research Agency.
They supported Donald Trump, Bernie Sanders and the Green party candidate Jill Stein during last year’s US presidential election campaign. Twitter said it also shut down 201 accounts associated with the agency.
The FBI is probing collusion between Trump’s campaign team and Kremlin-backed Russians. Facebook and Twitter execs will testify before US Congressional investigators next month.
There is no evidence Google knowingly took money from Russian operatives.