Final answer:
The Ottoman Turks declared war on Russia, sparking the Crimean War in 1853. The conflict exposed Russia's weaknesses and resulted in its defeat by the British and French forces.
Step-by-step explanation:
In 1853, the Ottoman Turks declared war on Russia, igniting the Crimean War. This conflict was caused by Russia's attempt to seize Ottoman lands along the Danube River. The war resulted in the defeat of the Russian army by the British and French forces who had come to assist the Ottoman Turks. It also exposed Russia's antiquated ways, lack of a railroad system, and inefficient military.