Ukrainian businessman Dmytro Firtash was detained in Vienna on 21 February.
The Vienna prosecutor's office told Deutsche Welle that technically, his detention is not connected with a court decision to allow his extradition to the USA. He was detained on a European warrant issued by Spain where he is suspected of money laundering.
In November, Spain declared Firtash and his two Ukrainian accomplices wanted in the multi-million-euro money laundering case which involved purchase of Spanish real estate.
The USA requested Firtash's extradition because the FBI suspects him of corruption while obtaining a permit to develop a titanium deposit in India.
Austrian Justice Minister Wolfgang Brandstetter will have a final say with regard to Firtash's extradition.