Polish agents gathered information on military personnel and facilities of the Russian Defense Ministry in the Kaliningrad region, the FSB reported.
The FSB identified the activities of an intelligence 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.