As U.S. warships steam toward Iran, Ankara is quietly preparing for a nightmare scenario. Turkish officials now fear that any strike on Tehran could trigger regime collapse and unleash a massive refugee wave across their eastern frontier. Reports say Turkey is planning buffer zones, fortifying borders and abandoning its once-open door policy. Haunted by the chaos of Iraq and Syria, Ankara is determined not to repeat history. With walls rising, drones watching and diplomats urging restraint, Turkey finds itself caught between a looming war and the human fallout it could unleash.