Finally Dmytro Firtash himself comes out and tells us about Giuliani's crooked business: "Tycoon Dmytro Firtash claims Trump’s personal lawyer promised to help with his Justice Department problems, if he helped with Giuliani’s dirt-digging mission." Daily Beast.
"Firtash claims that, in June, he met with Giuliani associates Lev Parnas and Igor Fruman, who offered help with his Justice Department problems if he hired two lawyers close to President Trump—Joseph diGenova and Victoria Toensing—and helped with Giuliani’s dirt-digging mission"
"Parnas’ lawyer has confirmed his client met Firtash at Giuliani’s request, and encouraged the oligarch to help in the hunt for compromising information “as part of any potential resolution to his extradition matter.” "
