In March 1878.
While the Russo-Turkish War was still ongoing, the Austro-Hungarian Empire moved its troops into Sarajevo, taking advantage of an agreement with Russia, as the Ottoman Empire's control over the Balkans teetered on the brink. This was a concession that Russia had offered to ensure Austro-Hungarian neutrality during the war.
Due to the interference from East Africa, Russia's expansion in the Central Asian steppes and the Western Asian regions did not proceed as smoothly as in history. Therefore, Russia, worried that the Austro-Hungarian Empire might suddenly change its stance, had to prematurely offer Bosnia and Herzegovina to buy Austro-Hungarian support.
The region of Bosnia and Herzegovina, known as Bosnia for short, was one of the most tumultuous regions in Europe in history, with Sarajevo, in particular, being famous as the spark that ignited World War I.
