Following one of these conflicts, one side was given the right to protect Christians in exchange for the return of the Danube Principalities via the terms of the Treaty of Kuchuk-Kainarji.
During one of these wars, the city of Chyhyryn changed hands five times. Another of these wars, in which one side launched the disastrous Bergmann Offensive and shattered the 3rd Army of their enemies at the Battle of Sarikamish, was a sub-theater of World War I. Following one of these conflicts, one side was given the right to protect Christians in exchange for the return of the Danube Principalities via the terms of the Treaty of Kuchuk-Kainarji. Yet another of them included the Siege of (*) Plevna and resulted in the creation of the Bulgarian state at the Treaty of San Stefano. For 10 points, name this staggering series of thirteen wars, including two won by Catherine the Great, fought by an Orthodox Christian and a Muslim empire.
During one of these wars, the city of Chyhyryn changed hands five times.
Russo-Turkish Wars [or Russo-Ottoman Wars; accept in either order]