What is the latest point WWI could be averted?

I personally think, that having Russia calling off the mobilization, or Kaiser Wilhelm II come back earlier (perhaps due to a change in plans), could limit WWI to a A/H vs. Serbia war, or a de-escalation of the crisis.
 

LordKalvert

Banned
Well avoiding situations where either side simply backs down which nobody was going to do. the war is very hard to avoid after Austria gets the blank check

Once the Germans give them that, the Austrians can drag a very unwilling Kaiser along with him

Austria has plenty of outs (Stop at Belgrade is probably the last) but she was determined on a war with Serbia

Without a change in attitude in Vienna, war is inevitable
 
June 28, 1914, with Archduke Franz Ferdinand and his wife leaving Sarajevo alive. If there isn't a war by 1917, then it has been completely averted. The Germans would hesitate to go to war with Russia because the 'window of opportunity' was closed.
 
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