sentences:  The Russo-Turkish War of 1877–78 was a conflict between the Ottoman Empire and the Eastern Orthodox coalition led by the Russian Empire and composed of several Balkan countries.Fought in the Balkans and in the Caucasus, it originated in emerging 19th-century Balkan nationalism.Additional factors included Russian hopes of recovering territorial losses suffered during the Crimean War, re-establishing itself in the Black Sea and supporting the political movement attempting to free Balkan nations from the Ottoman Empire.