Russian Empire
The Russian Empire, also known as Imperial Russia or simply Russia, was an empire that existed across Eurasia and North America from 1721, following the end of the Great Northern War, until the Republic was proclaimed by the Provisional Government that took power after the February Revolution of 1917.
Ottoman Empire
The history of the Ottoman Empire during World War I began with the Ottoman surprise attack on the Russian Black Sea coast on 29 October 1914. Following the attack, Russia and its allies, France and Britain, declared war on the Ottomans. There were several important Ottoman victories in the early years of the war, such as the Battle of Gallipoli and the Siege of Kut.