An investigation report released by China's National Computer Virus Emergency Response Center and cybersecurity company 360 outlines a clear chain of evidence that the U.S. National Security Agency has launched some 1,000 cyber-attacks on China's Northwestern Polytechnical University. What are the purposes of these attacks? What does the investigation tell us about the scale of U.S. cyber espionage against China and beyond? And what has China warned of a "jungle world" in global cyberspace?