"[A]lmost nobody in Central Europe stopped them. Russian spies openly went from general to general, from minister to minister, from one banking official to another, doing anything they wanted. After we entered NATO, our military intelligence had 200 officers with falsified documehts, holdovers from the Communist era. I got rid of them, though many in Warsaw objected to this."

http://observer.com/2017/11/interview-polish-defense-minister-antoni-macierewicz-on-russia-nato/amp/