N the early 1900s, after the Bolsheviks began to rule Russia,

the tsar and his family left Russia for Germany.

the fight for power resulted in a three-year civil war.

the Treaty of Brest-Litovsk was no longer honored.

the White Army declared support for the Bolsheviks.

In the early 1900s, after the Bolsheviks began to rule Russia, the fight for power resulted in a three-year civil war, the Russian Civil War.

Explanation:

The Russian Civil War took place between 1917 and 1922 following the Russian Revolutions. The war was mainly between the Bolsheviks and the whites who opposed them and ended in the Bolsheviks' victory. The war did not end with a ceasefire or a peace treaty, so it has no actual end date, but scattered battles continued in the Far East of Russia in the fall of 1922. Vladivostok was conquered by the Red Army on 25 October 1922.

With regard to the war with foreign troops, the Russian Socialist Federal Republic and the Soviet Union concluded peace agreements at various times and diplomatic relations were established over a long period. The last major recognitions of the Soviet Union in the 1930s came from the Western powers.