University of Oxford project finds Trump supporters consume largest volume of ‘junk news’ on Facebook and Twitter
"One thing the study did not find is evidence of substantial amounts of Russian news sources being shared."
A lot of the content tweeted by Russian bots and trolls isn't from Russian news sources. Anything that fans the flames of discontent and division is fair game. See the real-time dashboard at "Hamilton68: tracking Russian influence operations on Twitter": dashboard.securingdemocracy.org.