Once the ottoman's took over istanbul, they controlled the black sea, dardenelles, the eastern mediterranean, and the caspian sea, and therefore were a threat to western europe, as well as a constant figure in european diplomacy.

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Explanation:

The Ottoman Empire was a Turkish empire that conquered Istanbul in 1453, thus putting an end to the Byzantine Empire. The Ottomans expanded throughout the Middle East, North Africa, and Eastern Europe encompassing the regions around the Black Sea, Dardenelles, the Eastern Mediterranean, and the Caspian Sea until its fall in 1919. Therefore, the Ottoman Empire was a real threat to Western European powers for five centuries. The Turkish troops tried to invade central Europe, which failed in 1529 after the Sultan Suleiman the Magnificent did not succeed in its attempt during the Siege of Vienna in Austria. For the following centuries, the Ottoman empire was a political and military rival of European powers.