While I was looking for something else (Mueller’s characterization of Trump’s evasive written statements under oath– I think it was “incomplete and inadequate”), I came across these paragraphs on former National Security Advisor Michael Flynn. These are from the section, starting on page 191 of Mueller’s first volume, about obstruction of his investigation into Russian interference.
4. False Statements and Obstruction of the Investigation
The Office determined that certain individuals associated with the Campaign lied to investigators about Campaign contacts with Russia and have taken other actions to interfere with the investigation. As explained below, the Office therefore charged some U.S. persons connected to the Campaign with false statements and obstruction offenses.
Michael Flynn agreed to be interviewed by the FBI on January 24, 2017, four days after he had officially assumed his duties as National Security Advisor to the President. During the interview, Flynn made several false statements pertaining to his communications with the Russian ambassador.
First, Flynn made two false statements about his conversations with Russian Ambassador Kislyak in late December 2016, at a time when the United States had imposed sanctions on Russia for interfering with the 2016 presidential election and Russia was considering its response. See Flynn Statement of Offense. Flynn told the agents that he did not ask Kislyak to refrain from escalating the situation in response to the United States’s imposition of sanctions. That statement was false. On December 29, 2016, Flynn called Kislyak to request Russian restraint. Flynn made the call immediately after speaking to a senior Transition Team official (K.T. McFarland) about what to communicate to Kislyak. Flynn then spoke with McFarland again after the Kislyak call to report on the substance of that conversation. Flynn also falsely told the FBI that he did not remember a follow-up conversation in which Kislyak stated that Russia had chosen to moderate its response to the U.S. sanctions as a result of Flynn’s request. On December 31, 2016, Flynn in fact had such a conversation with Kislyak, and he again spoke with McFarland within hours of the call to relay the substance of his conversation with Kislyak. See Flynn Statement of Offense ¶ 3. 194 U.S. Department of Justice Attorney Work Product // May Contain Material Protected Under Fed. R. Crim. P. 6(e)
Second, Flynn made false statements about calls he had previously made to representatives of Russia and other countries regarding a resolution submitted by Egypt to the United Nations Security Council on December 21, 2016. Specifically, Flynn stated that he only asked the countries’ positions on how they would vote on the resolution and that he did not request that any of the countries take any particular action on the resolution. That statement was false. On December 22, 2016, Flynn called Kislyak, informed him of the incoming Trump Administration’s opposition to the resolution, and requested that Russia vote against or delay the resolution. Flynn also falsely stated that Kislyak never described Russia’s response to his December 22 request regarding the resolution. Kislyak in fact told Flynn in a conversation on December 23, 2016, that Russia would not vote against the resolution if it came to a vote. See Flynn Statement of Offense ¶ 4.
Flynn made these false statements to the FBI at a time when he was serving as National Security Advisor and when the FBI had an open investigation into Russian interference in the 2016 presidential election, including the nature of any links between the Trump Campaign and Russia. Flynn’s false statements and omissions impeded and otherwise had a material impact on that ongoing investigation. Flynn Statement of Offense ¶¶ 1-2. They also came shortly before Flynn made separate submissions to the Department of Justice, pursuant to FARA, that also contained materially false statements and omissions. Id. ¶ 5. Based on the totality of that conduct, the Office decided to charge Flynn with making false statements to the FBI, in violation of 18 U.S.C. § 1001(a). On December 1, 2017, and pursuant to a plea agreement, Flynn pleaded guilty to that charge and also admitted his false statements to the Department in his FARA filing. See id.; Plea Agreement, United States v. Michael T. Flynn, No. 1:17-cr-232 (D.D.C. Dec. 1, 2017), Doc. 3. Flynn is awaiting sentencing.
source at 194-195
Flynn is awaiting sentencing, the immediate dismissal of his case by Trump gunsel William Pelham Barr (who overruled Mueller and deemed Flynn’s lies innocently immaterial ), or, if all goes south, a pre-hearing — perfectly legal — pardon by the president.
 From Mueller (above)
Flynn’s false statements and omissions impeded and otherwise had a material impact on that ongoing investigation. Flynn Statement of Offense ¶¶ 1-2.
They also came shortly before Flynn made separate submissions to the Department of Justice, pursuant to FARA, that also contained materially false statements and omissions. Id. ¶ 5. Based on the totality of that conduct, the Office decided to charge Flynn with making false statements to the FBI, in violation of 18 U.S.C. § 1001(a).