The Treaty of Sofia was signed between the

Principality of Bulgaria The Principality of Bulgaria ( bg, Княжество България, Knyazhestvo Balgariya) was a vassal state under the suzerainty of the Ottoman Empire. It was established by the Treaty of Berlin in 1878. After the Russo-Turkish War ende ...

and

Kingdom of Serbia The Kingdom of Serbia ( sr-cyr, Краљевина Србија, Kraljevina Srbija) was a country located in the Balkans which was created when the ruler of the Principality of Serbia, Milan I, was proclaimed king in 1882. Since 1817, the Princi ...

on 31 March 1904. It was made up of two separate agreements regarding political and economical issues and first came into effect in April 1904. The second trade agreement was signed the following year. Influential Serbian politician Nikola Pašić sought to halt Austro-Hungarian influence. The alliance was unrealized due to Austro-Hungarian pressure and deteriorating Bulgarian–Serbian relations.

References

* * 1904 treaties 20th-century military alliances Treaties of the Principality of Bulgaria Treaties of the Kingdom of Serbia Military alliances involving Bulgaria Military alliances involving Serbia 1904 in Bulgaria 1904 in Serbia Bulgaria–Serbia relations Austria-Hungary–Serbia relations Economy of the Kingdom of Serbia March 1904 events {{Treaty-stub