Turkey’s worst insecurity, and thus nightmare, is nothing else but its territorial dismemberment and therefore anything that has to do with Kurdish autonomy regionally or nationally. As the situation in Syria is getting worse, Assad is focusing on securing Damascus and his own self and family, thus leaving the forces of the Democratic Union Party (PYD) in charge. The PYD is said to be linked to and have similar goals with the Turkey-based Kurdistan Workers Party (PKK) that has been fighting against the Turkish state for Kurdish autonomy since the early 80s. The fact that Kurdish flags in northern Syria and on border checkpoints with Turkey are becoming more and more can only be alarming for Turkey that is experiencing a déjà vu.
The first negative development for Turkey came with the gradual emergence of the Kurdish Regional Government (KRG) in northern Iraq. Ankara watched its establishment and solidification, during the two Iraq wars, without being able to do something while the Kurdish issue was one of the reasons the Turkish-American relations entered a period of decline, with the 2003 Iraq war notably being the starting point.