The Moscow informant was instrumental to the C.I.A.’s most explosive conclusion about Russia’s interference campaign: that President Vladimir V. Putin ordered and orchestrated it himself.
nytimes.com/2019/09/09/us/…
"That would almost certainly mean that some of the information the informant provided about the Russian interference campaign or Mr. Putin’s intentions would have been inaccurate."
"Some operatives had other reasons to suspect the source could be a double agent, according to two former officials, but they declined to explain further."