Sorry not the IG report, This:
There is no allegation in the indictment that any American was a knowing participant in the alleged unlawful activity. There is no allegation in the indictment that the charged conduct altered the outcome of the 2016 election.
Grand Jury Indicts Thirteen Russian Individuals and Three Russian Companies for Scheme to Interfere in the United States Political System
(third paragraph from the bottom.)
Re: February 16, 2018
Thank you for providing the link and the quote about no Americans being involved when the first group of Russians were indicted on February 16, 2018.