After the Austro-Hungary monarchy declared war on Serbia, France and Russia who were protecting Serbia declared war on Austria-Hungary. and then Germany declared war on Russia and France, then UK declared war on Germany...
Russia
Answer this question… Russia had an alliance with Serbia, and Germany had an alliance with Austria-Hungary.
Russia.
They went to war with Russia since Russia wanted to help Serbia since they were allies.
Austria-Hungary's future king was assassinated.
some guy from austria-hungary assassinated archbishop Ferdinand of Serbia. Serbia were allies of Russia and then Russia declared war on austria-hungary
Austria-Hungary, with the death of Archduke Ferdinand, declared war on Serbia, which caused a chain reaction of war induced countries. Austria Hungary to Serbia, then Russia to Germany, United Kingdom and so on.
Russia was the first Allied Nation to mobilize troops against Austria-Hungary for its declaration of war on Serbia.
Germany was allied with Austria-Hungary in 1914. Serbia was allied with Russia, and Russia was a member of the Triple Entente with France and Britain. When Austria declared war on Serbia after the assassination of Archduke Franz Ferdinand in Sarajevo. Russia declared war on Austria. Germany then declared war on Russia and subsequently on France and Britain.
Austria-Hungary's Archduke Franz Ferdinand was assinated by Serbian Extremists. After Serbia refuseds to turn in the extremists Austria-Hungary declared War on Serbia. Germany allied with A-H as Russia allied with Serbia, with more countries joining in later on in the War.
After archduke Ferdinand was assassinated, Austria Hungary declared war on Serbia. Russia then came to Serbia's aid because of an alliance and declared war on Austria Hungary. Germany declared war on Russia because of its alliance with Austria Hungary. Britain declared war on Germany because of its alliance with Russia. Other countries such as France and the Ottoman Empire soon chose sides and World War 1 began