WASHINGTON — An F.B.I. document released late Monday provides new details of how Michael T. Flynn, President Trump’s first national security adviser, lied to federal investigators about his conversations with the Russian ambassador during the presidential transition.

Prosecutors filed the document — an account by F.B.I. agents of their Jan. 24, 2017, interview with Mr. Flynn — on the eve of Mr. Flynn’s sentencing for lying to F.B.I. agents about his talks with the ambassador at the time, Sergey I. Kislyak. Mr. Flynn faces up to six months in prison for the offense, a felony.

Mr. Flynn has pleaded guilty to misleading investigators about a series of conversations he had with Mr. Kislyak in late December 2016 while serving as a key member of Mr. Trump’s transition team. The federal judge who will sentence him on Tuesday morning, Emmet G. Sullivan of the Federal District Court in Washington, ordered prosecutors to file a redacted version of the interview account, citing “the strong public presumption in favor of public access to judicial records.”

Mr. Flynn has admitted that he requested that Russia not escalate tensions between the countries after the outgoing Obama administration imposed sanctions against Russia for its interference in the 2016 presidential race. Russia agreed to not retaliate, an unusual decision that Mr. Trump himself praised.