Censor.NET reports citing Interfax.
Moscow City Court pronounced the verdict on Sept. 6. Lapygin was sentenced for seven years in high-security prison.
Lapygin taught at Moscow's Bauman State Technical Institute. Information on the university's page suggested he advised graduate students in the mechanical engineering department. Lapygin was also an employee of Tsniimash, the Central Research Institute of Machine Building, which develops rockets and is administered by the Roscosmos space agency.
Lapygin was reportedly accused of giving Russian secrets to China.
As Interfax sources reported, Lapygin faced an imprisonment for up to 12 years, but "admitted his guilt and collaborated with investigation."
The elderly engineer is just the latest person convicted for state treason and espionage in a list of Russians and foreigners which has been growing rapidly since 2014 and has included an air traffic controller, a housewife and a former intelligence officer.