The US Department of Justice has charged 12 Russian intelligence officers with hacking Democratic officials in the 2016 US elections.
Third, Friday's move also appears to show that the Mueller team and top Department of Justice officials such as Deputy Attorney General Rod Rosenstein are unintimidated by political threats against them.
The indictment, announced hours ago by Rosenstein, targets 12 Russian intelligence officers for engaging in a sustained effort to hack networks of Democratic Congressional Campaign Committee, the Democratic National Committee, and Hillary Clinton's campaign.
Before Friday, Mueller's group had charged 20 people and three companies in its investigation.
The charges come as Mr Mueller continues to investigate potential coordination between Russian Federation and the Trump campaign to influence the presidential election.
Mr Trump and Mr Putin are scheduled to hold talks on Monday in Finland, a meeting largely sought by Mr Trump. Presidential lawyer Rudy Giuliani on Friday tweeted that the indictments are good news - Russians have been nailed, no Americans are involved, and it's time for Mueller to wrap up his "pursuit of the President".
"The last indictment of Russians involved the so-called troll factories and online bot farms that were causing issues on Twitter", said John Bambenek, vice president at security firm ThreatStop Inc.
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The captain was the man of the match again in the penalty shootout win over Russian Federation in Sochi at the weekend. England are one of the favourites to win the World Cup and you have to respect that.
"The Russian state has never interfered and has no intention of interfering in the USA elections", Mr Putin's foreign affairs adviser, Yuri Ushakov, said.
The laundry list of charges included conspiracy against the United States, identity theft, money laundering and attempts to break into state election boards and various government agencies.
She also emphasized that the indictment did not allege that any American citizen committed a crime, that Americans knew that they were corresponding with Russians, or that the conspiracy changed the vote count or affected any election result. GRU units 26165 and 74455, the indictment says, "conducted large-scale cyber operations to interfere with the 2016 presidential election".
"Russia, if you're listening, I hope you're able to find the 30,000 emails that are missing", Trump said.
Some researchers said the indictment might have depended on USA signals intelligence, the fruits of which are rarely revealed, because it quotes electronic messages sent to an unidentified organization presumed to be London-based WikiLeaks.
Hours before the Justice Department announcement, Mr Trump complained anew that the special counsel's investigation is complicating his efforts to forge a better working relationship with Russian Federation. "This exchange is entirely public and provides no evidence of collaboration or collusion with Guccifer 2.0 or anyone else in the alleged hacking of the DNC emails, as well as taking place many weeks after the events described in today's indictment". Pure stupidity. But it makes it very hard to do something with Russian Federation. "I did it. You got me.' There won't be a Perry Mason here", he said.