Russia is employing "a range of measures" to undercut presumptive Democratic nominee Joe Biden and aid US President Donald Trump ahead of November's elections, the country's counterintelligence chief said Friday.

Axar.az reports citing foreign media that Moscow's efforts are centred not solely on harming Biden, but also "what it sees as an anti-Russia 'establishment,'” Director of the National Counterintelligence and Security Center William Evanina said in a statement.

"This is consistent with Moscow’s public criticism of him when he was Vice President for his role in the Obama Administration’s policies on Ukraine and its support for the anti-Putin opposition inside Russia," Evanina said about Biden.