Prosecutors contend that Mr. Browder had colluded with an agent of Britain’s foreign intelligence agency, MI6, “to cause the death of S. L. Magnitsky,” by persuading Russian prison doctors to withhold care.

The motive, according to what prosecutors said were intelligence intercepts, was to start a scandal, or “a significant news trigger to discredit the Russian Federation in the eyes of the international community.”

While they were about it, the prosecutors used the so-called intercepts, written in grammatically flawed English, to wrap into the plot two other Kremlin nemeses — Grigory A. Yavlinsky and Aleksei A. Navalny, prominent Russian opposition politicians. The supposed scheme was called Operation Quake.

On Tuesday, Facebook’s General Counsel Colin Stretch is expected to say that between 2015 and 2017, the troll farm posted about 80,000 times, and that roughly 29 million people received that content in their news feeds. Because those posts were also liked, shared, and commented on by Facebook users, the company estimates that three times more people - and at most 126 million - may have been exposed to a story that originated from Russian operatives.

The files show that in 2011, VTB funded a $191m investment in Twitter. About the same time, Gazprom Investholding financed an opaque offshore company, which in turn funded a vehicle that held $1bn-worth of Facebook shares.

The money flowed through investment vehicles controlled by Milner, who also invested in a startup in New York that Kushner co-owns with his brother. Kushner initially failed to disclose his own holding in the startup, Cadre, when he joined Trump’s White House.