https://www.theguardian.com/technology/2017/oct/26/twitter-bans-ads-from-russia-today-and-sputnik-over-election-interference

Company announced decision following US intelligence community’s conclusion that RT and Sputnik attempted to interfere with the US election

Twitter has announced that it will stop taking advertising from all accounts owned by Russia Today (RT) and Sputnik, effective immediately as US lawmakers continue to investigate the impact of foreign-sponsored fake news on the 2016 election.