https://www.theregister.co.uk/2017/10/26/twitter_russian_ads/

Twitter has kicked up a fresh new crop of controversies over both its advertising policies and its user numbers.

The San Francisco-based milliblogging giant said Thursday it would stop taking ads from two major Russian state-backed media outlets, Russia Today and Sputnik, effective immediately. Both publications had recently been fingered as helping in Russian efforts to influence last November's US presidential election by strategically purchasing and running political ads on Twitter.