WORLD HISTORY

Detailed explanation-1: -Russia’s threatening against Germany resulted in military action by German forces, which followed through with its own mobilization and a declaration of war on August 1, 1914. At the outset of hostilities, Russian forces led offensives against both Germany and Austria-Hungary.

Detailed explanation-2: -Russia. Following the declaration of war on Germany, Russian Emperor Nicolas II issued a manifesto announcing that in response to the Austro-Hungarian declaration of war against the Russian Empire, Russia would enter into war against Austria-Hungary. This occurred on on July 26, 1914.

Detailed explanation-3: -The Allies, or the Entente powers, were an international military coalition of countries led by France, the United Kingdom, Russia, the United States, Italy, and Japan against the Central Powers of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria during the First World War (1914–1918).

Detailed explanation-4: -Germany entered into World War I on August 1, 1914, when it declared war on Russia. In accordance with its war plan, it ignored Russia and moved first against France–declaring war on August 3 and sending its main armies through Belgium to capture Paris from the north.