Why did the allies badly need Russia in order to fight the Germans?

Russia entered World War I in the three days succeeding July 28, 1914 — beginning with Austria-Hungary's declaration of war against Serbia, a Russian ally. Via St Petersburg, the Russian Empire sent an ultimatum to Vienna warning Austria-Hungary not to attack Serbia. Following the invasion of Serbia, Russia began to mobilize its very large reserve army. Consequently, on July 31, the German Empire in Berlin demanded Russian demobilization. There was no response; hence, on the same day, Germany declared war on Russia. In accordance with its war plan, Germany ignored Russia and moved first against France by declaring war on August 3, and by sending its main armies through Belgium to surround Paris. The threat to France caused Britain to declare war on Germany on August 4. The main belligerents had been established. (The Ottoman Empire soon joined the Central Powers and fought Russia along their border.)

Historians researching the causes of World War I have emphasised the role of Germany and Austria-Hungary. Scholarly consensus has typically minimised Russian involvement in the outbreak of this mass conflict. Key elements were Russia's defence of Orthodox Serbia, its pan-Slavic roles, its treaty obligations with France, and its concern with protecting its status as a great power. However, historian Sean McMeekin has emphasised Russian plans to expand its empire southward and to seize Constantinople as an outlet to the Mediterranean Sea.[1]

Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, was assassinated by Bosnian Serbs on 28 June 1914 due to Austria-Hungary's annexation of the largely Slavic province. Vienna was unable to find evidence that the Serbian state had sponsored this assassination but, one month later, it issued an ultimatum to Serbia, which it knew would be rejected and thus lead to war. Austria-Hungary deemed Serbia to be deserving of punishment for the assassination. Although Russia had no formal treaty obligation to Serbia, it wanted to control the Balkans, and had a long-term perspective toward gaining a military advantage over Germany and Austria-Hungary. Russia had incentive to delay militarization, and the majority of its leaders wanted to avoid war. However, Russia had the support of France and feared that a failure to defend Serbia would lead to the loss of Russian credibility, constituting a major political defeat in its goal of controlling the Balkans.[2] Tsar Nicholas II mobilized Russian forces on 30 July 1914 to threaten Austria-Hungary if it invaded Serbia. Christopher Clark stated: "The Russian general mobilisation [of 30 July] was one of the most momentous decisions of the July crisis". The first general mobilization occurred before the German government had declared a state of impending war.[3]

Germany felt threatened by Russia, responding with its own mobilization and a declaration of war on 1 August 1914. At the outset of hostilities, Russian forces led offensives against both Germany and Austria-Hungary.[4]

Russia had incentive to delay militarization, and the majority of its leaders wanted to avoid war. However, Russia had the support of France and feared that a failure to defend Serbia would lead to the loss of Russian credibility, constituting a major political defeat in its goal of controlling the Balkans.

Explanation:

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MarkAsBrainliest

the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.