Polish agents gathered information on military personnel and facilities of the Russian Defense Ministry in the Kaliningrad region, the FSB reported.
The FSB found a network of Polish intelligence services in the Kaliningrad region.
Two agents of the Military Intelligence Service and the Polish Agency for Internal Security were arrested on suspicion of espionage.
Another 7 Polish citizens and three Russians were warned against the inadmissibility of espionage and treason, and Poles were refused entry into the Russian Federation.