The United States Intelligence Agencies conducted the assessment over 2016 presidential election campaign, Russian government officials devoted attention to assist Donald Trump's effort to win the election.
The Intelligence Agencies had identified individuals with connections to Russian government who provided thousands of hacked emails from Democratic National Committee and others including of Hillary Clinton's campaign to WikiLeaks.
US president Barrack Obama has ordered intelligence agencies to review cyber attacks and foreign intervention into 2016 election.
Russia denied the accusations.