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. (AP Photo/Pablo Martinez Monsivais)

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. (AP Photo/Pablo Martinez Monsivais)

WASHINGTON (AP) — A Dutch attorney who lied to federal agents investigating former Trump campaign chairman Paul Manafort was sentenced Tuesday to 30 days in prison in the first punishment handed down in the special counsel’s Russia investigation. He was also ordered to pay a $20,000 fine.

Alex van der Zwaan’s sentence could set a guidepost for what other defendants charged with lying in special counsel Robert Mueller’s investigation may receive when their cases are resolved. Among them are a former White House national security adviser and a Trump campaign foreign policy aide.

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Van der Zwaan, 33, had faced up to six months in prison under federal sentencing guidelines, and his attorneys had pushed for him to pay a fine and leave the country.

But U.S. District Judge Amy Berman Jackson, citing the need to deter others from lying in an investigation of international importance, said incarceration was necessary.

“These were not mistakes. These were lies,” Jackson told van der Zwaan as he stood before her. Being able to “write a check and walk away,” she added later, would not fit the seriousness of the crime or send the right message.

The criminal case against van der Zwaan is not directly related to Russian election interference, the main focus of Mueller’s probe. But it has revealed new details about the government’s case against Manafort and opened a window into the intersecting universes of international law, foreign consulting work and politics.

The case has also exposed connections between senior Trump campaign aides, including Rick Gates, and Russia. Just last week, the government disclosed that van der Zwaan and Gates spoke during the 2016 presidential campaign with a man Gates had previously described as having ties to the GRU, Russia’s military intelligence agency. Gates is now cooperating with Mueller.

During the hearing Tuesday, van der Zwaan made only a brief statement, telling Jackson, “Your Honor, what I did was wrong. I apologize to the court. I apologize to my wife.”

Van der Zwaan, who was fired last year by the high-powered international law firm Skadden, Arps, Slate, Meagher & Flom, admitted in February to lying to federal agents about his contacts with Gates and the person with ties to Russian intelligence.

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Van der Zwaan had previously grown close to Manafort, Gates and the person, Konstantin Kilimnik, during his work on a 2012 report commissioned by the Ukrainian Ministry of Justice. The report, written by the law firm, was about the corruption trial of former Ukrainian Prime Minister Yulia Tymoshenko. Kilimnik, who was born in Ukraine while it was a Soviet republic, has previously denied having any relation to Russian intelligence services.

Though prosecutors did not take a position on whether van der Zwaan should be locked up, they stressed that he had lied “repeatedly” to investigators. “This is not an isolated instance of bad judgment or criminal conduct,” prosecutor Andrew Weissmann said.

Van der Zwaan’s attorneys argued that he had suffered enough already. His life has been destroyed by his “terrible decision” to lie to federal authorities, they said. The attorneys pushed Jackson to allow van der Zwaan to return to London, where he lives with his wife, who is going through a difficult pregnancy.

“He has been here well over four months without a home, without his wife and without his family,” his attorney, William Schwartz, said. “He is literally in limbo.”

Schwartz stressed that his client had made the effort to return to the U.S. to “correct the record” after he lied to the special counsel’s office, though prosecutors took issue with the characterization, noting that van der Zwaan was under a grand jury subpoena at the time.

Jackson said she recognized that van der Zwaan has been away from his family for months, but the defense’s attempts to paint him as a tragic figure didn’t ring true.

“This is not something that happened to him. He did not suffer unavoidable circumstances of tragedy. This is something he did,” she said.

Jackson also said his signs of remorse were relatively “muted.” He didn’t write a letter to the judge, as his family and friends did, and hasn’t used his time in the U.S. to perform community service or other good deeds to make up for his actions, she said.

In addition to the prison time and fine, Jackson imposed two months of supervised released. She allowed him to voluntarily surrender to prison authorities.

The sentencing came just hours after another development in the special counsel’s investigation.

In a court filing late Monday, prosecutors revealed that Deputy Attorney General Rod Rosenstein had in August explicitly authorized the special counsel to investigate allegations that Manafort colluded with the Russian government.

Manafort has challenged Mueller’s authority and asked a judge to dismiss charges against him that include acting as an unregistered foreign agent and conspiring to launder tens of millions of dollars he received from his Ukrainian political consulting. He said Mueller overstepped his bounds by charging him for conduct that occurred years before the 2016 presidential election.

But in their new filing , prosecutors revealed that Rosenstein — who appointed Mueller — specifically authorized the investigation of any crimes related to payments Manafort received from the Ukrainian government during the tenure of former Ukrainian President Viktor Yanukovych. The description largely captures the charges against him.

Rosenstein also empowered Mueller to investigate allegations Manafort “committed a crime or crimes by colluding with Russian government officials” to interfere with the presidential election.

None of the charges Manafort faces alleges coordination with the Kremlin. He has pleaded not guilty and denied any wrongdoing related to Russian election interference.

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Associated Press writer Eric Tucker contributed to this report.

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Follow Chad Day on Twitter: https://twitter.com/ChadSDay