Russia was unprepared for the start of World War I. Nine years earlier it was defeated in the cap with Japan. There have been tensions over the social reforms demanded by the workers and the starving people. Despite the unsatisfactory status, the Russian people went to war. The start was not successful for Russia, there was not enough food and rifles. During 1916, the situation is improving a bit, but, on the other hand, social unrest is shaking the empire. Demonstrations and rebellions forced Tsar Nicholas to abdicate in February 1917. The provisional government was proclaimed. The Bolsheviks played a role in the further weakening of the Russian army, in order, finally, to take power from the Romanov dynasty in October 1917. This bloody event is known by the October Revolution. The state system has been changed from the root.
On the other hand, Western Europe also suffers changes after the First World War. There is no big empire, Austro-Hungarian, which was divided into smaller states. New borders are emerging between the countries. Germany was officially proclaimed the culprit who caused the war, and had to pay war reparations. The economy of Germany, as well as the army, was significantly weakened. In newly emerging countries an electoral democracy with the right to vote has been established, for the first time in history.
Unlike them in Bolshevik, Russia is ruled by a strong communist dictatorship under the leadership of one man, Lenin.