The indictment was of senior officers who worked in two units of Russian military intelligence, and that they covertly monitored computers, implanted malicious computer code and stole emails and other documents.
Special counsel Robert Mueller has indicted a dozen Russian intelligence officers in his probe into the Kremlin's meddling in the 2016 presidential election, Deputy Attorney General Rod Rosenstein announced Friday.
Trump told reporters in London Friday that he will "absolutely firmly" ask Putin about the finding by US intelligence agencies that he authorized the campaign of interference.
He also said the Russian defendants infiltrated computers at US state boards of election and secretaries of state, plus software suppliers whose products help election officials verify voter registration data.
Of the Russian interference - which Trump has repeatedly expressed doubts about - Tapper said, "According to his own justice department, it's not a joke".
The alleged conspirators hacked into the computer network of the Democratic Congressional Committee and Democratic National Campaign Committee.
The GRU agents indicted Friday, he said, used the alias "Guccifer 2.0" and a website called "DCleaks" to disseminate the stolen information, presenting them as fronts for American and Romanian hackers.
He continued: "Before these new indictments, these Russian individuals, Mueller had already brought forward 79 criminal charges against 20 individuals and three companies resulting in five guilty pleas and one sentencing".
Rosenstein said that while the defendants corresponded with several Americans through the internet, there was "no allegation in the indictment that the Americans knew they were communicating with Russian intelligence officers".
"There is no allegation in this indictment that any American citizen committed a crime".
The fresh indictments related to special counsel Robert Mueller's probe come amid U.S. President Donald Trump's United Kingdom visit, and just hours after he once again called the investigation a "witch hunt".
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