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The plan was impractical fantasy but
if it is implemented Austria is getting Bosnia and Serbia and, I assume, freedom of navigation on the Danube plus no future problems with the Turks. In other words, it is getting secure Eastern flank and, as a result, free hands in Germany.
Russia is getting mostly a hot air (geopolitical fantasies of Catherine and Potemkin usually did not bother with practicalities). Neo-Byzantine state is anything but “great” in size and power and would be a permanent drain on the Russian resources. Then there is a ticking bomb: “Kingdom of Dacia” created for Potemkin who does not have children and is going to die within few years. What are the succession rules? His only male relative was cousin Paul Potemkin. Is he going to become a new king? Not to mention that for maintaining even Potemkin’s usual life style resources of that poor kingdom would not be adequate and financial help from Russia is inevitable. And Russian finances during the reign of CII were going from bad to lousy with growing foreign debt and falling course of the paper money.
Plus there are “trifles” on the other side of the Bkack Sea: areas from the Kuban River and all the way to the green line mostly have to be conquered from the Ottomans and Persia and some of the formally Ottoman lands of the Northern Caucasus were not under any effective Ottoman control and, after being ceded, had to be conquered (it took decades and massive expulsions to pacify “Circassia”).
So who is going to get a worse deal is an open question.