1. Involment in World War I cause hardships in Russia. Reacting to the Austrian attack on Serbia, Russia begins full mobilization of its troops. Germany demands that it stop. August 1, 1914 - Germany declares war on Russia
2. A rebellion forces Tcar Nicholas II from power. It happened in March 1917.
3. Vladimir Lenin and the Bolsheviks seize power. October 1917
4. Russia pulls out of Word War I. Germany joined the peace talks in December 1917.