The Greeks still credit the Orthodox Russians to one extent or another. They do not credit the Western secular, Latin or protestant powers. Stopping the Mohammedan Turks at Vienna didn’t save the Balkans from centuries under the heel of the Ottomans, but the sack of Constantinople by the 4th Crusade absolutely assured the fall of The City two centuries later and centuries of oppression to this very day.
If the Turks were not stopped at Vienna, the liberation of the Balkans would not be feasible, and that was Catholic West that stopped them. The sack of Constantinople was indeed a disaster, but so was the deliberate on the part of Byzantium failure of the Florentine Union, which was the proximate cause of the fall of the City.