Title: Rusko-bŭlgarskite taĭni dogovori, bŭlgarskii︠a︡t suverenitet i nezavisimost, i t︠s︡ar Ferdinand
Subjects: Sources, Foreign relations, Diplomatic relations
Places: Bulgaria, Russia
People: Ferdinand I Czar of Bulgaria (1861-1948), Nicholas I Emperor of Russia (1796-1855)
Time periods: 1878-1944, 1894-1917