Which historical factors have had a particularly strong influence on the state system of russia?

The history of Russia begins with that of the East Slaves. The first East Slavic state, Kievan Rus', adopted Christianity from the Byzantine Empire in 988,[1] beginning the synthesis of Byzantine and Slavic cultures that defined Russian culture for the next millennium.[2] Kievan Rus' ultimately disintegrated as a state, finally succumbing to Mongol invaders in the 1230s. During this time a number of regional magnates, in particular Novgorod and Pskov, fought to inherit the cultural and political legacy of Kievan Rus'.
After the 13th century, Moscow gradually came to dominate the former cultural center.[2] By the 18th century, the Grand Duchy of Moscow had become the huge Russian Empire, stretching from Poland eastward to the Pacific Ocean. Expansion in the western direction sharpened Russia's awareness of its separation from much of the rest of Europe and shattered the isolation in which the initial stages of expansion had occurred. Successive regimes of the 19th century responded to such pressures with a combination of halfhearted reform and repression. Russian serfdom was abolished in 1861, but its abolition was achieved on terms unfavorable to the peasants and served to increase revolutionary pressures. Between the abolition of serfdom and the beginning of World War I in 1914, the Stolypin reforms, the constitution of 1906 and State Duma introduced notable changes to the economy and politics of Russia,[3] but the tsars were still not willing to relinquish autocratic rule, or share their power.[4]