Mother of Europe

What would happen if Germany didn't declare war on Russia, which would mean Austria-Hungary needed to fend for herself, in turn causing no WW1? (which in turn means no WW2).

POD
It's 1914, July Crisis. The world is on the brink of war over the assasination of Franz Ferdinand. The world gasps when Serbia refuses to do all 10 of the demands the ultimatum has. Austria-Hungary, almost, almost surely backed by Germany, cuts the last string of peace and invades Serbia. However, to her horror, Germany refuses to help, afraid a war with Russia would give France an excuse to re-take their territory of Alsace-Lorraine. Germany scrambles to retain good relations and even elevates French as a co-official language in the Imperial Territory. France continues to make relations better by offering a few resources. Meanwhile, Austria-Hungary imposed martial law into Bosnia and Herzegovina, and Russia advances into Galicia and Transylvania.

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