The ITU Regional Seminar for CIS & Europe was held in St. Petersburg from 6 to 8 June to discuss the latest technologies and trends in the development of modern radiocommunication ecosystems. Co-organized by ITU and Peter the Great St. Petersburg Polytechnic University (SPbPU), the seminar addressed the appropriate solutions for the sustainable use of the radio frequency spectrum as a scarce resource in enabling the development of the digital economy through mobile, transport, navigation and space systems.