http://www.washingtonpost.com/blogs/the-switch/wp/2017/10/26/twitter-bans-russian-government-news-sites-rt-and-sputnik-from-buying-ads/

Twitter is banning two Russian government-affiliated news sites from advertising on its platform, the social network said Thursday.

Twitter said its decision to block advertising from the sites stemmed from the conclusion of the U.S. national intelligence report in January that said that the Kremlin used the sites Russia Today (RT) and Sputnik, along with a far-flung network of “quasi-government trolls,” to interfere in the 2016 U.S. presidential election.