China denies suggestions it stole designs for new U.S. fighter

“Cyber attacks are hard to trace back and are usually committed across borders. This complexity means that it is extremely difficult to identify the source of the attacks.”

Der Spiegel released a new trove of leaked top-secret documents on Saturday, it says are from the archive of Snowden, a former contractor for the National Security Agency. He is currently living in Russia and faces charges of espionage in the United States.

CNN