Modern international law recognizes only three lawful justifications for waging war: self-defense, defense of an ally required by the terms of a treaty, and approval by the United Nations.
The war in Russia made people more open to new ideologies that eventually took Bolsheviks to power.
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The Byzantine Empire influenced many cultures, primarily due to its role in shaping Christian Orthodoxy. The modern-day Eastern Orthodox Church is the second largest Christian church in the world. Orthodoxy is central to the history and societies of Greece, Bulgaria, Russia, Serbia, and other countries.
Byzantine architecture, particularly in religious buildings, can be found in diverse regions from Egypt to Russia. During the Byzantine Renaissance—from 867 to 1056—art and literature flourished. Artists adopted a naturalistic style and complex techniques from ancient Greek and Roman art and mixed them with Christian themes. Byzantine art from this period had a strong influence on the later painters of the Italian Renaissance.
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