https://arstechnica.com/information-technology/2017/10/twitter-drops-hammer-and-sickle-on-rt-sputnik-ad-buys-over-election-shenanigans/

In a blog post published today, a spokesperson for Twitter announced that the company has decided to block paid advertisement posts by Russian media outlets RT and Sputnik. "Twitter has made the policy decision to off-board advertising from all accounts owned by Russia Today (RT) and Sputnik, effective immediately," the post stated.

The bans are the result of "retrospective work" done by Twitter's global public policy team to investigate the use of the service during the 2016 presidential elections to conduct state-sponsored influence campaigns. The US intelligence community found "that both RT and Sputnik attempted to interfere with the election on behalf of the Russian government," the Twitter spokesperson wrote.