Nicholas II or Nikolai II (Russian: Николай II Алекса́ндрович, tr. Nikolai II Aleksandrovich; 18 May [O.S. 6 May] 1868 – 17 July 1918), known as Saint Nicholas the Passion-Bearer in the Russian Orthodox Church, was the last Emperor of Russia, ruling from 1 November 1894 until his forced abdication on 15 March 1917. His reign saw the fall of the Russian Empire from one of the foremost great powers of the world to economic and military collapse. He was given the nickname Nicholas the Bloody or Vile Nicholas by his political adversaries due to the Khodynka Tragedy, anti-Semitic pogroms, Bloody Sunday, the violent suppression of the 1905 Russian Revolution, the execution of political opponents, and his perceived responsibility for the Russo-Japanese War (1904–1905). Soviet historians portrayed Nicholas as a weak and incompetent leader whose decisions led to military defeats and the deaths of millions of his subjects.

Russia was defeated in the 1904–1905 Russo-Japanese War, which saw the annihilation of the reinforcing Russian Baltic Fleet after being sent on its round-the-world cruise at the naval Battle of Tsushima, off the coasts of Korea and Japan, the loss of Russian influence over Manchuria and Korea, and the Japanese annexation to the north of South Sakhalin Island. The Anglo-Russian Entente was designed to counter the German Empire's attempts to gain influence in the Middle East, but it also ended the Great Game of confrontation between Russia and the United Kingdom. When all Russian diplomatic efforts to prevent the First World War (1914–1918) failed, Nicholas approved the Imperial Russian Army mobilization on 30 July 1914, which gave Imperial Germany formal grounds to declare war on Russia on 1 August 1914. An estimated 3.3 million Russians were killed in the First World War. The Imperial Russian Army's severe losses, the High Command's incompetent management of the war efforts, and lack of food and supplies on the home front were all leading causes of the fall of the House of Romanov.