A Chinese aerospace engineer has been sentenced to 15 years in prison for espionage, according to state media, with the report underscoring official warnings that the aerospace industry is a cornerstone of national technological strength and defence security. The engineer, surnamed Zhu, graduated from a top university with a PhD in 2018, state broadcaster CCTV said on Monday. He then worked as an engineer in multiple aerospace research institutes and handled classified documents in the aerospace...