He's the first person to be sentenced in special counsel Robert Mueller's probe.
"What I did was wrong", he said to the judge, reading quietly from a single sheet of paper after his defense attorney and the prosecutor each spoke. "I apologise to this court, and I apologise to my wife", van der Zwaan said at the sentencing hearing. "I await your judgment".
Van der Zwaan is a London-based Dutch attorney who worked for the law firm Skadden, Arps, Slate, Meagher & Flom.
The memo, which had not previously been released publicly and remains redacted in parts, said that Mueller was empowered to investigate allegations that Manafort "committed a crime or crimes by colluding with Russian government officials" to interfere with the presidential election.
He pleaded guilty on February 20 as Mueller intensified his investigation into potential collusion between the president's campaign and Russian Federation, and told prosecutors he lied to FBI agents about previous communications with Rick Gates, a Manafort protege who held a senior position in the Trump campaign. Mr Gates has admitted conspiracy and lying to investigators in a plea deal.
Mr Mueller has secured two indictments against Mr Manafort arising from his lobbying for the pro-Russian Ukrainian Party of Regions, with charges ranging from failing to register as a foreign agent and conspiring to launder money, to bank fraud and filing false tax returns.
"These were lies", Jackson told van der Zwaan as he stood before her.
A Dutch lawyer who pleaded guilty to lying to federal investigators was sentenced Tuesday to 30 days in prison and ordered to pay a $20,000 fine by a federal judge.
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He also is married to the daughter of billionaire German Khan who owns the Alfa Group, Russia's largest financial and industrial investment group. Gates pleaded guilty and is cooperating with the probe, while Manafort faces a trial later this year.
Alex van der Zwaan raises his arms as he goes through security checkpoint during his arrival Federal District Court in Washington, Tuesday, April 3, 2018.
The charges appear minor, but Mueller has always been insistent that van der Zwaan serve time in jail for his misstatement.
"I assure you", she said, "that right now that while this might feel like the most momentous thing in your life, much of the story of your life, indeed the majority of the story of your life, has yet to be written".
"It is unusual conduct to make a false statement, and then immediately provide proof of a false statement", Schwartz said, saying for if it were another defendant those tapes "could have found their way to the bottom of the Thames" River in London.
Prosecutors alleged that van der Zwaan falsely told federal investigators that he last communicated with Gates in mid-August 2016 through an innocuous text message.
Manafort's legal team has argued that Rosenstein inappropriately gave the special counsel's office an unlimited "blank check" when he authorized Mueller last May to investigate any matter that "arose or may arise" from an examination of the Trump team's ties to Russian Federation. Gates and Manafort worked closely with Yanukovych before he was removed from power in 2014.
Trump has repeatedly denied his campaign colluded with the alleged Russian effort, and has dismissed Mueller's inquiry as a "witch hunt" as speculation has mounted over whether he would terminate it.