TY JOUR TI "The Bulgarian Gambit" - a combination of Russian diplomacy in 1912-1913, its causes and consequences KW Russian diplomacy KW Balkan knot KW Russian-Bulgarian relations KW S. Sazonov KW Second Balkan War KW Southern Dobrudja JO AU Kidinov, Y.Y. PY 2025 IS 10 PB INFRA-M Academic Publishing LLC.