Why would Germans worry about the alliance between France and Russia?

The alliance between France and Russian worried Germans because it created the possibility of a two-front war in which Germany would be fighting on both its eastern and western borders. This was a nightmare scenario for German military planners, as it would have stretched the German army to breaking point.

In addition to the military concerns, there were also political and ideological reasons why Germans worried about the alliance between France and Russia. France was seen as a revanchist power, determined to regain the territory it had lost to Germany in the Franco-Prussian War of 1870-71. Russia, meanwhile, was seen as an expansionist power, with ambitions in Eastern Europe and the Balkans. The combination of these two powers was seen as a threat to German security and the balance of power in Europe.

The alliance between France and Russia also had a significant impact on German foreign policy. In order to counter the perceived threat from the Franco-Russian alliance, Germany forged alliances with Austria-Hungary and Italy, creating the Triple Alliance. This system of alliances intensified the rivalries between the European powers and set the stage for World War I.