"On September 12, the Russian Supreme Court considered an appeal filed by the defense, as well as its arguments, and ruled to uphold the Moscow City Court’s verdict concerning Polish national Marian Radzajewski, found guilty under Article 276 of the Russian Criminal Code (espionage)," the statement reads.

Radzajewski was found guilty of attempting to acquire certain secret components of the S-300 missile system and illegally transport them to Poland, which posed a genuine threat to Russia’s national security.

He was caught red-handed while trying to strike a deal. "Investigators proved that Marian Radzajewski had acted in the interests of Poland’s leading supplier for the national armed forces and intelligence agencies," the FSB pointed out.

On June 25, the Moscow City Court sentenced Radzajewski to 14 years in a maximum-security colony. His defense filed an appeal with the Russian Supreme Court, requesting that the charge be reclassified from espionage to an attempted smuggling of materials and equipment that may be used in the production of weapons (Article 30.1 and Article 226.1.1 of the Russian Criminal Code), so that the Polish national’s sentence could be mitigated.