Moscow city court has conducted a closed-door trial into the case of Polish citizen Marian Radzajewski, accused of espionage, the Russian Federal Security Service stated. This reported by Sputnik.

The Moscow city court found Polish citizen Marian Radzajewski guilty of Article 276 of the Russian Criminal Code, espionage, the court's press service stated.

"He was sentenced to imprisonment for a term of 14 years in a strict regime colony", the press service added.

The trial was conducted in a closed session, since its materials contain information constituting state secrets.

According to the Russian Security Service (FSB), Radzajewski tried to obtain secret parts of the S-300 anti-aircraft missile system. When trying to make a deal, he was detained red-handed.

Radzajewski reportedly acted in the interests of a Polish organisation, the leading supplier for Poland's national armed forces and special services.

In March, Russian President Vladimir Putin stated Russia's special services intercepted almost 600 foreign intelligence officers and agents last year.