: Well as the article states, the start of and the nature of the war is sketchy. Its an on and off war. But I would have to argue when the Azov camapign began, since although the war lasted until 1696, the Austrians and Russians concluded the same Traety of Karlowitz in 1699. Its quite subjective, since the Russians had been at war with various Turkish Khanate allies of the Ottomans before Peter the Great. I'm not saying that the Russians got out of their way to send troops south to the Danube and help their "fellow Christians". That is not ncessarily being an ally. You don't have to do this, and this what you seem to be asking for, right? Well no, Russian troops never in my knowledge fought side by side with Austrian troops against the Ottomans. They may have slightly at some point fough side by side in 1848 against the Revolutions but Russia's de facto anti-Ottoman alliance with Austria is established by a common enemy amongst other things.