Since 2014 Firtash has been fighting extradition to the United States under a federal indictment.[4][5][6] He and other pro-Russia Ukrainians were implicated in efforts by Rudy Giuliani and his associates in seeking information that might damage Biden's 2020 presidential prospects.[7][8] These efforts are the subject of two ongoing federal investigations by the Manhattan and Brooklyn U.S. attorneys offices.[9]