Did Russia help Serbia by declaring war on the Austro-Hungarian Empire?

Question by Glenn Harvey Fingler: Why do you think that Russia helped Serbia by declaring war on the Austro-Hungarian Empire in 1914?
Solzhenitsyn wrote that friendship should stop short of self-immolation, in reference to this. The Russians knew that war with Austria-Hungary also meant war with Germany.

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Answer by capnbilly
it was a mutual defense treaty

just as Austria-Hungary had one with Germany

and France and England had one with each other and Russia

was basically like dominoes, once one fell they all fell

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