To expand upon what I said earlier, unless you are in or neighboring the Ottoman's "de jure" territory (which in Europe, extends to about Venice-Austria-Poland-Lithuania-Muscovy) you don't need to come into conflict with the Ottomans. Regardless of how good of game the Ottomans are having, the AI really doesn't expand beyond southern Austria and Slovakia, because of missions directing conquests elsewhere and following the Mamluks into the Indian Ocean and the south Pacific.
I think you might be trying to play the "balance of power" too hard. While the Ottomans are the "end boss" (along with nonexploded Ming), they aren't a threat to Western Europe (or even much of Central Europe). In fact, France is probably the Ottoman's favorite ally, behind Tunis and Crimea. You shouldn't come into any natural conflict with the Ottomans during early and mid game, and unless you are blobbing hard, probably not even in the late game. (If the Ottomans follow the Mamluks into the south Pacific, they might start colonizing the west coast of the Americas, which will cause them to desire the land of New World subjects, causing them to hate you forever. But, that won't happen until the 18th century, if at all.)
The best course of action is to ally the Ottomans unironically. The AI tends to do worse when allied to the player even when you don't try to shaft your allies. Short of a specifically anti-Ottoman opening, that is probably the best way to control the Ottomans. They really won't be "contained," the Ottomans will still eat up the near east, but they will be less powerful than they otherwise would have been.
I think you might be trying to play the "balance of power" too hard. While the Ottomans are the "end boss" (along with nonexploded Ming), they aren't a threat to Western Europe (or even much of Central Europe). In fact, France is probably the Ottoman's favorite ally, behind Tunis and Crimea. You shouldn't come into any natural conflict with the Ottomans during early and mid game, and unless you are blobbing hard, probably not even in the late game. (If the Ottomans follow the Mamluks into the south Pacific, they might start colonizing the west coast of the Americas, which will cause them to desire the land of New World subjects, causing them to hate you forever. But, that won't happen until the 18th century, if at all.)
The best course of action is to ally the Ottomans unironically. The AI tends to do worse when allied to the player even when you don't try to shaft your allies. Short of a specifically anti-Ottoman opening, that is probably the best way to control the Ottomans. They really won't be "contained," the Ottomans will still eat up the near east, but they will be less powerful than they otherwise would have been.
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