Balkan Wars
Reactions among the Great Powers during the wars

The developments that led to the First Balkan War did not go unnoticed by the Great Powers. Although there was an official consensus between the European Powers over the territorial integrity of the Ottoman Empire, which led to a stern warning to the Balkan states, unofficially each of them took a different diplomatic approach due to their conflicting interests in the area. As a result, any possible preventive effect of the common official warning was cancelled by the mixed unofficial signals, and failed to prevent or to stop the war:

The Second Balkan war was a catastrophic blow to Russian policies in the Balkans, which for centuries had focused on access to the "warm seas". First, it marked the end of the Balkan League, a vital arm of the Russian system of defense against Austria-Hungary. Second, the clearly pro-Serbian position Russia had been forced to take in the conflict, mainly due to the disagreements over land partitioning between Serbia and Bulgaria, caused a permanent break-up between the two countries. Accordingly, Bulgaria reverted its policy to one closer to the Central Powers ' understanding over an anti-Serbian front, due to its new national aspirations, now expressed mainly against Serbia. As a result, Serbia was isolated militarily against its rival Austria-Hungary, a development that eventually doomed Serbia in the coming war a year later. Most damaging, the new situation effectively trapped Russian foreign policy: After 1913, Russia could not afford to lose its last ally in this crucial area and thus had no alternatives but to unconditionally support Serbia when the crisis between Serbia and Austria escalated in 1914. This was a position that inevitably drew Russia into an unwelcome World War with devastating results since it was less prepared (both militarily and socially) for that event than any other Great Power.

Austria-Hungary took alarm at the great increase in Serbia's territory at the expense of its national aspirations in the region, as well as Serbia's rising status, especially to Austria-Hungary's Slavic populations. This concern was shared by Germany, which saw Serbia as a satellite of Russia. These concerns contributed significantly to the two Central Powers' willingness to go to war against Serbia. This meant that when a Serbian backed organization assassinated Archduke Franz Ferdinand of Austria, the reform-minded heir to the Austro-Hungarian throne, causing the 1914 July Crisis, the conflict quickly escalated and resulted in the First World War.
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