The claim
Denied discussing U.S. sanctions on Russia with the Russian ambassador during the transition and denied asking Russia not to retaliate against Obama-era sanctions.
Made in: Interview with the FBI and public statements
The proof
Flynn pleaded guilty to making false statements to the FBI about his contacts with Russian ambassador Sergey Kislyak. He cooperated with the Mueller investigation, then had his case dismissed on procedural grounds and was pardoned by Trump.
The record
United States v. Flynn — U.S. District Court for the District of Columbia · No. 1:17-cr-00232-RJL
Outcome: Pleaded guilty to making false statements (December 1, 2017); case dismissed (November 2020); pardoned by Trump (November 2020)
The person admitted the facts under oath in open court, before a judge, to end a criminal case. The strongest record possible: self-incrimination.
Flynn cooperated with the Mueller investigation before seeking to withdraw his plea. The case was dismissed on procedural grounds, and he was pardoned. The guilty plea is a legal record.