Adamov insisted he is innocent at a press conference in Moscow today, two days after his former partner pleaded guilty on similar charges.
"I continue to believe today that I should stand trial in a U.S. court as long as the United States gives guarantees to our state that my participation in this trial will not become a channel for a leak of information that is sensitive to our country," Adamov said.
U.S. prosecutors allege Adamov and Mark Kaushansky stole $9 million in U.S. money intended to improve Russia's nuclear safety. Kaushansky pleaded guilty on September 25 in a U.S. federal court.
Adamov was arrested in May 2005 in Switzerland and extradited to Russia to face similar charges. He has been free on bail since July.