He added, "The lies were material to the investigation. The defendant's lies to the FBI in January 2017 impeded the FBI's investigation into Russian interference in the 2016 presidential election. Most immediately, those statements substantially hindered investigators' ability to effectively question the Professor when the FBI located him in Washington, D.C. approximately two weeks after the defendant's January 27, 2017 interview. The defendant's lies undermined investigators' ability to challenge the Professor or potentially detain or arrest him while he was still in the United States. The government understands that the Professor left the United States on February 11, 2017 and he has not returned to the United States since then."