Sorensen said the way the investigation unfolded makes clear the difficulties of international prosecutions. Although he was indicted more than nine months ago, Firtash was not arrested until officials had confirmed he'd stepped foot in Austria, which has a strong extradition treaty with the U.S. While Austrian courts will likely order Firtash to be turned over to the U.S. – provided he doesn't jump bail – the road to bringing the rest of the defendants to justice could be much bumpier, Sorensen said.