On November 2, a military jury had acquitted Roman Slivkin and the other defendants.
Slivkin's lawyer said that his client has not been dismissed from his post in the security services, and that when the not-guilty verdict takes effect, he will return to his FSB job.
A court spokesman said the criminal case against them had been opened as part of the murder case of Forbes Russia editor Paul Klebnikov, but it turned out later that there was no link to the Klebnikov case.
Charges of abduction, extortion, armed robbery and forgery were brought against three FSB officers (Roman Slivkin, Oleg Sachkov, and Dmitry Frolov) and three civilians (Andranik Aleksanyan, Vladislav Yudichev, and Alexander Kolyadin).
Slivkin's lawyer said his client was released from custody in the courtroom, adding that another defendant, Andranik Aleksanyan, remained in custody, as he is serving a prison sentence for other crimes.
Slivkin has been in custody since October 5, 2004 on charges of kidnapping a banker, extortion, and other crimes.