WASHINGTON — Special counsel Robert Mueller III recommended Tuesday that former national security adviser Michael Flynn serve no prison time, citing his “substantial assistance” with several ongoing investigations, according to a new court filing.

Flynn was forced out of his post as national security adviser in February 2017 after the White House said he misled administration officials, including Vice President Mike Pence, about his contacts with Sergey Kislyak, Russia’s ambassador to the United States at the time.

National Security Adviser Michael Flynn at the White House on Feb. 1, 2017, shortly before he was forced out of his post. Jabin Botsford/The Washington Post

Since then, Flynn has been cooperating with Mueller’s investigation into Russian interference in the 2016 campaign, and his full account of events has been one of the best-kept secrets in Washington. He is one of five Donald Trump aides who have pleaded guilty in the special counsel probe.

The special counsel’s new filing Tuesday is the first time prosecutors have described Flynn’s assistance since the former national security adviser’s guilty plea in December 2017.

In it, prosecutors said Flynn has assisted with several ongoing investigations – participating in 19 interviews with federal prosecutors.

Tuesday’s filing is heavily redacted, continuing to shroud in secrecy the details of what Flynn told Mueller’s team about his interactions with Trump and other top officials.

But the document noted that Flynn has assisted the special counsel with its “investigation concerning links or coordination between the Russian government and indivuadals associated with the Trump campaign.”

Flynn pleaded guilty to one felony count of making a false statement, despite a longer list of charges he could have faced. Prosecutors said last year they would likely seek a prison sentence between zero and six months.

The generous terms offered by the special counsel indicate that Flynn’s cooperation is viewed as highly useful to Mueller’s investigation, legal experts said.

As part of his investigation, Mueller has been working to determine whether any of Trump’s allies coordinated with Russia or sought help for his campaign. Prosecutors have sought to learn whether Trump urged Flynn’s outreach to the Russian ambassador to signal that the new White House team would go easy on the Russian government.

During the presidential transition, Flynn had several contacts with Kislyak. In early December 2016, he attended a meeting at Trump Tower in New York, during which Trump’s son-in-law Jared Kushner proposed to the Russian ambassador setting up a secret communications channel with the Kremlin, according to people briefed on intelligence reports.

Later in the month, Flynn spoke with Kislyak about U.S. sanctions on Russia and other topics, Flynn admitted in his plea last year. Flynn also told prosecutors that he was in touch with senior Trump transition officials before and after his communications with the ambassador.

In his plea agreement, Flynn said he contacted the Russian ambassador on Dec. 22, 2016, about the incoming administration’s opposition to a U.N. resolution condemning Israeli settlements as illegal and requested that Russia vote against or delay it. Kislyak called back a day later to say that Russia would not vote against the resolution, court records show.

In another conversation, on Dec. 29, Flynn called Kislyak to suggest the incoming president was not a fan of the sanctions imposed by the Obama administration and asked Russia not to escalate the ongoing feud, according to filings.

Russian President Vladimir Putin issued a statement Dec. 30 saying Russia would not retaliate against the U.S. sanctions at that time.

The following day, the ambassador called Flynn to inform him of Russia’s decision to honor Flynn’s request, according to the records.

Flynn admitted he had lied to FBI agents about his interactions with the ambassador when they interviewed him just four days after the inauguration, but also asserted that others in Trump’s transition team knew about his talks with Kislyak, according to court filings.

Flynn told prosecutors that a “very senior member of the Presidential Transition Team” had directed him to contact officials from foreign governments, including Russia, about the U.N. resolution on Israel.

That official is also not named, but people familiar with the matter have said it refers to Kushner. According to one transition team official, Trump’s son-in-law told Flynn that blocking the resolution was a top priority of the president-elect.

Flynn also admitted that before speaking with the ambassador on Dec. 29, he called a senior transition official at the Mar-a-Lago resort, where Trump was staying, “to discuss what, if anything, to communicate to the Russian ambassador about the U.S. Sanctions.” Flynn learned that transition members did not want Russia to escalate the situation, according to court papers.

The senior transition official is not identified in records, but people familiar with the matter identified the official as K.T. McFarland, a onetime Flynn deputy.

McFarland, who initially denied to FBI agents ever talking to Flynn about sanctions in the call, subsequently revised her statement and told investigators they may have discussed sanctions, The Washington Post previously reported.

Two major questions were left unanswered by Flynn’s 2017 guilty plea: whether Trump instructed Flynn to call the ambassador and why Flynn lied about the contacts in the first place.

When Flynn pleaded guilty, then-White House lawyer Ty Cobb said the national security adviser’s lies had nothing to do with the president.

“Nothing about the guilty plea or the charge implicates anyone other than Mr. Flynn,” Cobb said.

Trump has repeatedly said he did not urge Flynn to call or discuss sanctions with the Russian ambassador.

“No,” he told reporters in a February 2017 news conference when asked whether he directed the call. “I didn’t.”

Trump said then that he was troubled that Flynn failed to tell Pence about his contacts with the Russian ambassador, but not by the interactions themselves.

“It certainly would have been OK with me if he did it. I would have directed him to do it if I thought he wasn’t doing it,” Trump told reporters. “I didn’t direct him, but I would have directed him because that’s his job.”

Flynn’s lie to FBI agents on Jan. 24, 2017, about his contacts with the Russian diplomat set in motion one of the biggest tumults of Trump’s presidency. It stunned senior Justice Department officials, who felt they had to warn the White House. The aftershocks still shadow Trump’s administration.

Two days later, then-acting Attorney General Sally Yates visited the White House to alert White House Counsel Donald McGahn about Flynn’s dishonesty.

McGahn immediately told Trump, who expressed surprise that the Justice Department was criticizing his choice of advisers just days after he took office.

Trump didn’t act to correct Flynn’s account or remove him until Feb. 9, when The Post revealed Flynn had talked to Kislyak about sanctions and lied about it.

Flynn resigned on Feb. 13, just 24 days in his position, the shortest tenure of a national security adviser on record.

A few days later, Trump hosted then-FBI Director James Comey for a dinner, where Comey said that Trump stunned him by asking him to show lenience in investigating Flynn. According to Comey’s later testimony, Trump told his FBI director that Flynn was a good man and said: “I hope you can let this go.”

Trump has said he does not recall saying that to Comey.

Trump’s discussion with Comey became another subject of Mueller’s inquiry: examining whether Trump had sought to obstruct the probe of his campaign’s contacts with Russia.

Mueller will have an opportunity to lay out additional pieces of the evidence he has been gathering later this week. On Friday, prosecutors with the special counsel’s office are scheduled to file a letter to the judge who sentence Michael Cohen, the president’s former attorney. The letter will outline additional details of Cohen’s cooperation with Mueller’s office.

Also Friday, Mueller’s team will also submit a filing to a judge in Washington describing ways that Trump’s former campaign chairman Paul Manafort lied to prosecutors after pleading guilty in September and promising to cooperate. Prosecutors have said that Manafort breached his agreement by continuing to be dishonest in meetings with prosecutors.

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