They both wanted dominance of the Balkans. Austria-Hungary controlled Bosnia and Herzegovina were there were a large number of ethnic Serbs. So Serbia believed they should control this area. In Russia at the time there was a belief in pan-Slavism (that all the Slavs in the world should help each other, in this case Russia should help Serbia). So when Austria-Hungary threatened to invade Serbia if its demands were not met in 1914 Russia came to help its ally and "Slav brother" Serbia, this would also serve to give Russia dominance in the Balkans.
They went to war with Russia since Russia wanted to help Serbia since they were allies.
They went to war with Russia since Russia wanted to help Serbia since they were allies.
The Austrian archduke and his wife were assassinated in Sarajevo, while riding in their car, by a Serbian with a pistol. Austria began punitive measures against Serbia, and Russia moved against Austria to help Serbia.
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Russia considered itself "Protector of the Slavic People," and the Serbs were Slavic. Thus, Russia felt an obligation to help. Of course, this reason was probably simply the propaganda reason (i.e., the reason the Tsar told his people they needed to come to Serbia's aid).
It went to war aginst Germany and then later the Ottoman empire too.
Russia came to the aid of Serbia because they were slavs and the Czar felt a special kinship to Serbia and not Austria-Hungary. Austria-Hungary were allied with the Ottoman Empire, Germany and Bulgaria. Serbia wanted its independence from the Hapsburgs and knew that the Romanovs would support them militarily.
The allied side. The assassination of Archduke Franz Ferdinand sparked a war causing Austria and its allies to declare war on Serbia and Russia. Soon, the allies of Serbia and Russia declared war on Austria. Then, when Great Britain and France declared war, the US wanted to help their allies, causing them to join the allies.
Austria-Hungary issued an ultimatum to Serbia to fix the damage. The demands were harsh. Russia stepped into the conflict to help Serbia. Fearing an attack from Austria's ally Germany, Russia began to mobilize troops to the Russo-German border. Germany took it as a threat and responded with a declaration of war and an inavsion of Belgium. World War I had its start.
Russia and Serbia are brotherly countries, because of the slavic origin of the two nations and Orthodox religion and both countries fought the nazi and fasists in the past. Every Serbian is a friend to Russian and Greek.
They caused upheaval by creating an alliance with Russia and supplying guns to the Black Hands ( a kind of gang ) which with the help of Gavrilo Princip, killed Archduke Franz Ferdinand