What was the effect of russia mobilizes along german border effects?

The effect of Russia mobilizing along the German border was that Germany declared war on Russia, marking the official start of World War I. On July 30, 1914, Austria-Hungary, with the backing of Germany, declared war on Serbia after the assassination of Archduke Franz Ferdinand. Russia, as an ally of Serbia, began to mobilize its forces along the borders with Germany and Austria-Hungary. When Germany's ultimatum to Russia to stop mobilization went unheeded, Germany declared war on Russia on August 1, 1914. This prompted France, Russia's ally, to declare war on Germany as well. Germany then invaded neutral Belgium, leading to Britain's declaration of war on Germany on August 4, 1914. Thus, the initial mobilization of Russian forces in response to the crisis in Serbia ultimately triggered a chain of events that escalated into World War I.