How did conflict in serbia between austria-hungary and russia ignite world war 1?

In the times following the Austrian collapse in connections with Serbia, the rest of Europe, including Russia’s associates, Britain and France, seemed on with alarm, apprehending the expected disruption of a Balkans dispute that, if penetrated into by Russia, frightened to split into a general European war. The British Foreign Office requested its equivalents in Berlin, Paris, and Rome with the plan of a global organization directed at reducing the dispute; the German administration, though, was set against this idea and suggested Vienna go forward with its ideas.