Ukrainian oligarch Dmytro Firtash is pictured prior to a public hearing at the higher regional court in Vienna on February 21, 2017. The Austrian appeals court authorised the extradition to the United States of Ukrainian oligarch Dmytro Firtash on bribery charges, overturning an earlier ruling. Firtash, 51, one of Ukraine's richest men and previously an ally of ousted president Viktor Yanukovych, was arrested in Austria in March 2014. / AFP PHOTO / APA AND PHOTONEWS.AT / Georges SCHNEIDER / Austria OUT