Title: Rozvidka i kontrrozvidka Bohdana Velykoho (1648-1657 rr.)
Subjects: Secret service, Cossack-Polish War, 1648-1657, Espionage, History, Intelligence service
Places: Ukraine
People: Bohdan Khmelʹnyt︠s︡ʹkyĭ (ca. 1594-1657)
Time periods: Revolution, 1917-1921