"I made a awful mistake for which I paid dearly and I am terribly ashamed", Papadopoulos said at his sentencing hearing.
Papadopoulos has cooperated for more than a year with Special Counsel Robert Mueller's probe into Russian interference in the US presidential election and possible collusion with the Trump campaign. That probe was later taken over by Mueller.
He said Papadopoulos's deception required investigators to scour more than 100,000 emails and gigabytes of data to reconstruct the timeline of his contacts with Russians and Russian intermediaries.
The sentencing judge, U.S. District Judge Randolph Moss, agreed to allow Papadopoulos to surrender at a future date and to travel between now and then to NY and California, where his lawyer said he is considering relocating. Jeff Sessions taking an interest in a meeting between Trump and Russian President Vladimir Putin.
Before the sentence was read, Papadopoulos' defense attorney, Thomas Breen, pointed fingers at Trump. He was the first to plead guilty in Mueller's probe and is now the first Trump campaign adviser to be sentenced. His client was also affected by Trump's cries of "fake news" and his casting of the Russian Federation investigation as a "witch hunt" just days before his FBI interview.
The punishment was far less than the maximum six-month sentence sought by the government but also more than the probation that Papadopoulos and his lawyers had asked for.
His case was the first to detail a member of the Trump campaign having knowledge of Russian efforts to interfere in the 2016 presidential election while it was ongoing.
U.S. District Judge Randolph Moss said Papadopoulos' deception was "not a noble lie" and said 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. Papadopoulos says he had nothing to do with the leak.
No connection between Mr Misfud and the hacked emails has been proven.
Trump reaction: Trump's campaign tapped Papadopoulos to be on its foreign policy advisory panel. 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.
Partly as a result, they said, agents were unable to "effectively question" Misfud when he visited the United States two weeks later. The lies did not impede the investigation, he argued.
United Kingdom indicts two Russian spies in Salisbury poisoning
Basu said the passports were genuine but the names were probably aliases, and appealed to the public to help identify the men. Moscow strongly denies involvement in the attack, and Russian officials said they did not recognise the suspects.
It's all a part of Robert Mueller's investigation.
Papadopoulos' attorneys had asked for probation for their client and said in court filings that Papadopoulos misled investigators to try to save his professional ambitions and out of a "perhaps misguided loyalty to his master" but not for more sinister reasons.
Then speaking directly to Papadopoulos, Moss said: "I know the sentence is painful to you". "The message for all of us is to check our loyalty, to tell the truth, to help the good guys".
Minutes later, Trump seemed to claim vindication.
"14 days for $28 MILLION - $2 MILLION a day, No Collusion". "No Collusion. A great day for America!"
While Papadopoulos still must surrender himself and serve the two-week prison stint, he is already looking beyond it and planning a move to California to begin his new life supporting his wife's fledgling acting career. But when pressed, Papadopoulos refused to completely shut the door on the possibility that the information made its way to other people on the campaign.
Speaking to reporters aboard Air Force One on Friday ahead of the sentencing, Trump played down his relationship with Papadopoulos.
"It was at best begrudging efforts to cooperate and we don't think they were substantial or significant in any regard", he said.
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. In that, he said, he differed from Alex van der Zwaan, a Dutch lawyer who pleaded guilty to deceiving the special counsel's office about his work for Paul Manafort, the president's former campaign manager, who was convicted last month on fraud charges.
Before he must surrender to prison, Papadopoulos may be able to travel to NY and to California, where he plans to relocate.