The FSB identified the activities of an intelligence network belonging to the Polish intelligence services in the Kaliningrad region.
Two agents of the Polish military intelligence and the internal security service were arrested in the Kaliningrad region on suspicion of espionage, the FSB reports.
For assisting the Polish intelligence services, 14 Polish citizens had their visas revoked, and six were refused entry to Russia.
According to the FSB, Polish intelligence officers gathered information about military personnel, facilities belonging to the Russian Ministry of Defense and the general situation in the Kaliningrad region.