The Ukrainian Ministry of Internal Affairs has started actively cooperating with the Federal Bureau of Investigation (FBI) as part of the investigation into fraud allegedly committed by a group of companies owned by businessman Dmytro Firtash, Interior Minister Arsen Avakov has said.

"According to our contacts, we've created an ad hoc group and have been working with FBI experts for several days already, exchanging materials and data in connection with a number of counts of these investigations," Avakov told reporters on Wednesday, when commenting on the investigation into Ostchem company.