Russia, Ukraine, and China have been named as the world’s cybercrime hotspots in a new study ranking the most significant sources of cybercrime threats. The World Cybercrime Index, published in the journal PLOS One, said Russia housed the greatest cybercrime threat, followed by Ukraine, China, the United States, and Nigeria. The ranking -- compiled by academics with the University of Oxford and the University of New South Wales Canberra -- was based on surveys of almost 100 cybercrime experts who were asked to identify the most significant sources of five major types of cybercrime.