"I made mistakes and I will pay for my mistakes", he said, adding, "I don't want to give up my goal of staying in politics".
In his pre-sentencing statement, Papadopoulos admitted lying to FBI investigators in January 2017 but said it had been out of a desire to protect his career and a naive loyalty to the Trump administration.
The lawyers portrayed Papadopoulos as "out of his depth" as a foreign policy adviser for a candidate for whom he had "unbridled loyalty".
But he said he was moved by what he viewed as Mr. Papadopoulos's "genuine remorse". He hasn't returned since.
"My entire life has been turned upside down".
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Thomas Breen, Papadopoulos's lawyer, admitted that his client had been "naive" and "a fool", but he also cast blame on President Trump.
"The President of the United States hindered this investigation more than George Papadopoulos ever could", Mr. Breen told the judge.
Twelve Russian intelligence officers were indicted by a federal grand jury on July 13, accused of hacking Democratic Party computer networks in 2016, in the most detailed USA accusation yet that Moscow meddled in the presidential election to help Trump.
However, prosecutors argued the former aide's lies were indeed "material to the investigation".
Also on August 21, a jury in federal court in Alexandria, Virginia, found former Trump election campaign chairman Paul Manafort guilty on eight of 18 charges of filing false tax returns, failing to disclose his offshore bank accounts and bank fraud.
But he said then-senator and now-Attorney General Jeff Sessions "was actually enthusiastic".
He was also given a £7,300 ($9,500) fine and community service. But he acknowledged that Papadopoulos was unsophisticated, naive and even a "fool" for having made contacts with Russian Federation intermediaries during the campaign.
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I've had an incredible two weeks. "Today things were going against us, we fought really hard to try to get back into the match". She struggled to hold back tears as she said: "I got a little emotional out there".
During his sentencing hearing Papadopoulos said his case should serve as a warning to others.
Trump sought to ridicule the sentence, suggesting that it was trivial accomplishment for an investigation that has cost millions since it began in May 2017 - while ignoring the 35 indictments, five guilty pleas and one trial conviction Mueller has racked up so far.
Even after his arrest and plea agreement a year ago, prosecutors say Papadopoulos continued to be hard with investigators, only providing information after being confronted with documents such as emails and text messages.
But Papadopoulos, referring to Sessions, said to CNN, "I remember that he was enthusiastic about a potential meeting".
In subsequent campaign communications, Papadopoulos was encouraged to pursue a Putin-Trump meeting.
That led the aide to boast about his find in a London bar that was overheard by an Australian diplomat which then was reported to the Federal Bureau of Investigation.
The investigation into alleged Russian interference in the USA elections has since been turned over to Special Prosecutor Robert Mueller.
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After the initial introduction, the two texted each other but didn't actually meet in-person until about six months later. However, the late-night host advised the couple to refrain from using that name.