"So if you add up what they [Russia] spent in American, French and British elections combined, it was less then the cost of one new F-35 airplane," the senator said during his speech at the Center for Strategic and International Studies in Washington late on Thursday.
It is noteworthy, in 2016, the cost of the cheapest modification of the F-35 jet was estimated at around $94 million.
Warner also said that Congress still had a lot of work to do in relation to the Russia probe.
"I'm very proud of our bipartisan investigation and we still got more work to do, more witnesses to see," Warner added.
The senator expressed hope that Special Counsel Robert Mueller's probe would yield new results soon and stressed that it was all the more important to protect the integrity of the investigation given the results of the recent midterm elections in the United States.
"We need to make sure, particularly now post-midterms, particularly now when the president seems more and more unleashed, that we protect the integrity of the Mueller investigation and allow it to finish its work," Warner noted.
The senator's comments come after Washington has repeatedly accused Russia of meddling in the 2016 presidential election in order to influence the results of the vote in favour of then-Republican candidate Donald Trump. The United States has claimed that Russia colluded with the Trump campaign in order to help its candidate win and tried to influence voters via social media. Washington has also accused Russian hackers of allegedly targeting email accounts of the US Democratic Party.
Russia has repeatedly refuted the allegations, arguing that they had never been substantiated and insisting that Moscow does not interfere in the internal affairs of other countries. Trump and the White House, in their turn, have repeatedly denied allegations of collusion, with the US president calling the probe a "witch hunt".