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Bulgarian-Serbian relations are foreign relations between Bulgaria and Serbia. They established diplomatic relations on 18 January 1879 as the Principality of Serbia (independent) and Principality of Bulgaria (vassal of the Ottoman Empire which exercised de facto independence). Bulgaria has an embassy in Belgrade. Serbia has an embassy in Sofia.
Both countries are full members of the Southeast European Cooperation Process, of the Stability Pact for South Eastern Europe, of the Central European Initiative, of the Southeast European Cooperative Initiative and of the Organization of the Black Sea Economic Cooperation. The countries share 318 km of common borderline.
The relationship between Serbia and Bulgaria is divided between cooperation and conflicts. Bulgaria recognized Kosovo as an independent country in 2008, which temporarily strained relations between two nations.