He told the US District Court in Washington DC: "I made a bad mistake for which I paid dearly and I am terribly ashamed".
Thirteen Russians and three Russian entities were indicted in Mueller's investigation in February, accused of tampering in the 2016 election to support Trump.
Two other Trump aides - former deputy campaign chairman Rick Gates and former national security adviser Mike Flynn - also pleaded guilty and agreed to cooperate with Mueller's investigation but haven't been sentenced.
U.S. District Judge Randolph Moss said that Papadopoulos' deception was "not a noble lie" and that he had lied because he wanted a job in the Trump administration and didn't want to jeopardize that possibility by being tied to the Russian Federation investigation. "My entire life has been turned upside down". The conversations actually occurred after he was brought on as a foreign policy adviser. He admitted to lying about those contacts to Mueller's team, which investigators said led them to miss a chance to interview the professor, Joseph Mifsud.
In the following months, thousands of emails linked to the Clinton campaign were published by Wikileaks.
U.S. Open: Novak Djokovic sets up del Potro final in NY
I didn't take any pleasure in watching Nadal go through the motions in that second set - especially in case he did more damage. Nadal leads the series 11-5, though del Potro routed him in straight sets in the 2009 semifinals.
In subsequent campaign communications, Papadopoulos was encouraged to pursue a Putin-Trump meeting.
The lies Mr. Papadopoulos told in his voluntary interview with the Federal Bureau of Investigation on January 27, 2017, prosecutors said, "undermined investigators' ability to challenge the professor or potentially detain or arrest him while he was still in the United States".
Shortly after news of the sentence broke, CNN's Jake Tapper unfurled a look at his one-hour interview with Papadopoulos. Jeff Sessions was a fan of his plan to have candidate Donald Trump meet with Russian ruler Vlad Putin.
He also played a role in kick starting that investigation, after drunkenly telling an Australian diplomat the Russians had dirt on Hillary Clinton.
The envoy told USA investigators, shortly after the emails hacked from the Democratic Party were leaked.
"It wasn't an offer", he said Friday night, denying that Mifsud had dangled the possibility of funneling the emails to the Trump campaign.
Ajayi inspires Eagles to winning start against Falcons
The events will end at 8 p.m. ahead of the Eagles 8:20 p.m. kickoff when they'll take on the Atlanta Falcons . The Eagles offense was booed on its way to the tunnel at halftime after gaining just 68 yards on 30 plays.
No connection between Mr Misfud and the hacked emails has been proven.
He has cooperated for more than a year with the probe into Russian interference in the U.S. presidential election, and possible collusion with the Trump campaign.
It referred to him as a key figure to have evaded the Mueller inquiry. Told the campaign's priority was to improve relations with Russian Federation, within weeks Papadopoulos made contact with a mysterious professor, Joseph Mifsud, who touted links to the Kremlin.
Ultimately, Moss said he felt Papadopoulos expressed genuine remorse. At the same time, according to the investigation, at the time former adviser to trump already knew about the appointment. His judge referred to his regret as "muted".
In response, defense lawyer Thomas Breen said his client was "remorseful" that his lies impeded the investigation.
Packers Quarterback Carted Off Field Against Bears, Return Uncertain
While there is no set prognosis for Aaron Rodgers' injury, former National Football League doctor David J. He was initially evaluated in the medical tent before being taken back to the locker room on a cart.