The monograph is devoted to the confrontation between the Soviet and Japanese intelligence services in the period 1918–1945. The efforts of the USSR state security agencies at this time were aimed primarily at preventing and suppressing the reconnaissance and subversive activities of the Japanese special services, as well as the sabotage and terrorist activities of the nationalist underground in the Far East. The book is intended for everyone interested in the history of Soviet-Japanese relations in the 20th century. The text is presented in the author's edition.