RUSSIAN AND GERMAN AGENT INTELLIGENCE BEFORE AND DURING THE FIRST WORLD WAR (1914–1918): AN ANALYSIS BASED ON K. K. ZVONAREV. Journal of Multidisciplinary Sciences and Innovations, [S. l.], v. 5, n. 01, p. 1460–1463, 2026. DOI: 10.55640/. Disponível em: https://ijmri.de/index.php/jmsi/article/view/4892. Acesso em: 30 apr. 2026.