David Rush, who also confessed to providing secrets to a foreign government, had revealed the existence of a "clandestine human source", prosecutors said.
August Hanning is accused of obtaining classified information for a foreign power.
The UK's internal security service had warned universities they may have unintentionally assisted China's espionage.
British universities are being urged to sever ties with China General Technology Research Institute which is linked to the Chinese Ministry of State Security (MSS).
Matthew Dunn worked for MI6 and has created a stage play, going behind the scenes of an operation.
A nondescript toilet block in a Hampshire town was at the heart of a Soviet spy ring operation.
For years, Hungary was viewed as Russia's closest ally in the EU, but the new government has dropped the pro-Kremlin stance.
The suspect was working as an intern in Nato's Supreme Headquarters Allied Powers (Shape) Europe in Mons, Belgium.
Chen Youlin's family says he has been wrongfully detained for nearly two years on spying charges.
