"Twitter accounts subsidiary with Russia Today, an outlet with solid connections to the Russian government, advanced more than 1,800 tweets that unquestionably or conceivably focused on the US showcase", the organization said in an announcement.
Colin Crowell, Twitter's vice president for public policy, met with the Senate Select Committee on Intelligence and House Permanent Select Committee on Intelligence to divulge what was uncovered.
Twitter noted that the 201 accounts were not properly registered as advertisers on the platform, and that it will continue its investigation into the matter and take action if it sees other accounts violating its terms of service. The senator said Twitter's presentation showed the company failed to understand the significance of the advertisements or "the threat it posts to democratic institutions".
Twitter declined to comment when asked about Warner's comments. Mark Warner, a Democrat from Virginia, told reporters the response was inadequate and had mostly relied on data from Facebook, the AP reported.
It hasn't been a good week for the most unloved social media platform.More news: Catalonia referendum: Schools occupied ahead of vote
Google is digging deep into its own systems to find out if Russia-connected individuals or groups used its ads or services to try to influence the presidential election that brought President Donald Trump to power, new reports said.
Facebook Inc. FB, +1.27% and Twitter Inc.
Users, lawmakers and technology analysts have long criticised Twitter as too lax in policing fake or abusive accounts.
Social media users might be shocked to hear just how much Russian Federation has been influencing their feeds.
Warner said that the explanation of Twitter were "deeply disappointing", and he suggested that the company does not understand the gravity of the investigation by Congress into alleged Russian interference in the 2016 presidential elections.
The social media giant is facing intense fake news scrutiny after disclosing details about the presence of Russian political ads worth $100,000 on its platform during the presidential election.
Twitter said it wanted to strengthen disclosure rules on political advertising, as Facebook has just done.