"We have not received a ruling from the federal court and we do not even know about possible dates," Stefan Wehrenberg said. "I am still hoping to get the ruling before Christmas."
Earlier, spokesperson for the Swiss Federal Court Antoinette Schneider said the court had not decided on Adamov's case and declined to indicate any possible dates.
Adamov, who served as Russia's nuclear power minister in 1998-2001, was arrested in Bern May 2 at the request of U.S. authorities, who are accusing him of misappropriating the $9 million granted to Russia for improving the safety of its nuclear facilities.
The Russian Prosecutor General's Office also launched proceedings against Adamov, charging him with embezzlement and the abuse of office.
Both countries petitioned for Adamov's extradition. Although the U.S. requested his arrest May 2, Swiss authorities did not receive the extradition request until June 24. Moscow's request for extradition was received May 17.
On October 3, the Swiss Federal Justice Department announced its decision to extradite the former Russian minister to the U.S.
Adamov's defense team appealed the decision at the Lousanne court in November.
Until the federal court, whose rulings are final, rules on the appeal, Adamov will remain in custody in Bern. The court is not bound by a deadline.
