MOSCOW — An engineer at a Russian space facility primarily used for military rocket launchings and ballistic missile research was sentenced to 13 years in prison on Friday for passing on classified military information to the C.I.A., according to Russia’s domestic intelligence agency, the F.S.B.

A curt statement posted on the agency’s Web site identified the engineer as Vladimir V. Nesterets, a lieutenant colonel who worked at the Plesetsk space center, a military installation in the northwest of the country close to the port city of Archangelsk.

In a closed-door trial at a military court, Mr. Nesterets pleaded guilty to “delivering classified information about tests relating to Russia’s newest strategic military rocket complexes to the C.I.A. in the United States,” the statement said, adding that he received financial compensation for his services.

The F.S.B., a traditionally secretive organization that is Russia’s successor to the K.G.B., did not elaborate on the claims against Mr. Nesterets, nor did it reveal when the act took place. The C.I.A. declined to comment. The Russian authorities rarely release details about cases involving government secrets, and it is unclear why any information about Mr. Nesterets was made public.