One country's geography acts as a global power switch
Geography
By controlling a single nineteen-mile stretch of water, one nation can effectively lock the door to the Black Sea and reshape the security of three continents.
Turkey sits atop the Bosphorus Strait, a narrow maritime artery that serves as the only exit for the Russian Black Sea Fleet. This geographic choke point gives Ankara a literal kill switch over global trade and naval movements, a power codified by the 1936 Montreux Convention.