Key players in the Trump-Russia investigation

A look at the key players entangled in special counsel Robert Mueller's Russia probe.

PAUL MANAFORT

The former chairman of Trump's campaign has been convicted in Washington and Virginia of crimes related to years of Ukrainian political consulting work, including allegations he concealed his foreign government work from the United States and failed to pay taxes on it. Though the charges don't directly touch Trump, he's nonetheless remained a figure of considerable intrigue and enjoys the continued sympathy of the president, who has left open the door for a pardon. He is now serving a more than seven-year prison sentence.

» RELATED: Mueller: Manafort 'brazenly violated the law' for years | Manafort accused of sharing 2016 election data with Russians | DOJ: Manafort met Russian offering 'political synergy'

MICHAEL FLYNN

Trump's former national security adviser pleaded guilty to lying to the FBI just days after Trump took office by telling agents that he had never discussed sanctions with the then Russian ambassador to the United States. The White House said Flynn had misled administration officials, including Vice President Mike Pence, about the conversation and ousted him weeks later. He's since become a vital cooperator for Mueller.

» RELATED: Michael Flynn pleads guilty to making false statements to FBI | Officials: Trump knew about Flynn misleading weeks before ouster

MICHAEL COHEN

Trump's longtime lawyer and fixer is at the center of not only Mueller's investigation but also a separate, and rapidly mushrooming, investigation into hush-money payments. In Mueller's investigation, Cohen has admitted lying to Congress about a proposed real estate development in Moscow. He told lawmakers the negotiations were done in January 2016 when in fact they stretched deep into the campaign. He also pleaded guilty in New York to campaign finance violations stemming from the payments, with prosecutors saying last week that he "acted in coordination and at the direction of Individual 1" - or Trump.

» RELATED: Cohen's damning testimony about Trump alleges lie after lie | Cohen confesses to lying about Trump Tower Moscow deal | Cohen pleads guilty, implicates Trump in hush-money scheme

GEORGE PAPADOPOULOS

The former Trump campaign foreign policy adviser served a 14-day prison sentence after admitting lying to the FBI about a 2016 conversation with a Maltese professor who told him that Russia had "dirt" on Hillary Clinton in the form of stolen emails. Information about Papadopoulos' contacts during the campaign started the FBI's Russia investigation.

» RELATED: Former Trump campaign adviser sentenced to 14 days in prison

RUSSIAN INTELLIGENCE

Twelve Russian military intelligence officers were charged in July with hacking into email accounts of Clinton's presidential campaign and the Democratic Party and then facilitating the release of tens of thousands of private communications. It remains perhaps the most direct example of what intelligence officials say was a broad conspiracy by the Kremlin to meddle in the 2016 election on Trump's behalf.

» RELATED: 13 Russians charged with meddling in 2016 presidential race

RUSSIAN ONLINE TROLLS

A separate indictment charges 13 Russians with funding a covert social media propaganda campaign to sow discord among Americans in the run-up to the 2016 presidential election. Prosecutors say the scheme was run by a Russia-based troll farm that used bogus social media postings and advertisements fraudulently purchased in the name of Americans to try to influence the race.

» RELATED: Facebook ads show Russian effort to stoke political division

ROGER STONE

A longtime Trump confidant, and self-proclaimed "dirty trickster" of Republican politics, Stone is charged with witness tampering and lying to Congress about his efforts to gain advance knowledge of WikiLeaks' plans to release damaging information on Clinton during 2016. Though a Stone tweet from 2016 - "Trust me, it will soon the Podesta's time in the barrel" - appeared to presage the disclosure of hacked emails, Stone has said he had no inside knowledge about the content, source or timing of WikiLeaks' disclosure. He has also pleaded not guilty to the federal charges brought by Mueller.

» RELATED: Trump confidant Roger Stone charged with lying about hacked emails | Key takeaways from Roger Stone's indictment in Russia probe

JULIAN ASSANGE

The WikiLeaks founder, under Justice Department scrutiny for years for the group's role in publishing government secrets, has been an important figure in the Mueller investigation as investigators examine how WikiLeaks obtained emails stolen from Clinton's campaign and Democratic groups. Prosecutors have also investigated whether any Americans were involved in coordinating that effort. Separately, prosecutors in the Eastern District of Virginia inadvertently disclosed the existence of a sealed criminal complaint against the WikiLeaks founder, though no details have been publicly announced.

» RELATED: Report: Manafort met with Julian Assange ahead of 2016 leaks

DONALD TRUMP JR.

The president's eldest son has attracted scrutiny for his role in arranging a Trump Tower meeting in June 2016 - also attended by Manafort and Trump son-in-law Jared Kushner - at which he expected to receive damaging information on Clinton. He has said the meeting was a waste of time because he didn't receive anything interesting from the attorney, Natalia Veselnitskaya. Both he and his father have suggested that anyone in that position would have taken such a meeting in hopes of getting dirt on a political opponent.

The meeting has been of interest to investigators, who have called multiple participants before the grand jury.

» RELATED: Questions surround scuttled Trump Tower Moscow deal