The Turkish president Erdogan made a deal with the imprisoned leader of the Kurdistan Workers’ Party (PKK) Abdullah Öcalan. The first part of the deal is a ceasefire that will stop attacks by the PKK on Turkish state security entities and vice versa. The PKK will pull out its fighters from Turkey and move them into north Iraq. The Turkish army will not interfere with this retreat.
The second part of the deal is political and will be enshrined in a new constitution. Erdogan promises some political autonomy for Kurdish parts of the country instead of today's much centralized state. The mayors the Kurds elect in their cities will in future be able to act on their own and without interference from today's centrally appointed governors. As their part of the deal the Kurds will support Erdogan's dream of changing Turkey in a presidential republic with himself taking the then much more powerful presidency.
As previous negotiations with other political parties have shown, Erdogan would not be able to change the constitution to fit his personal plans without the votes of the Kurd and their Peace and Democracy Party (BDP).
This plan may work but there are significant potential spoliers. When a letter from Abdullah Öcalan announcing the ceasefire was read to a million Kurds who came together in Diyarbarkir there was not one Turkish flag visible but thousands of Kurdish flags.
To the Turkish nationalist this proves their suspicion that the Kurds plan to split from Turkey and, together with north Iraq and parts of Syria, form their own state. They will do their best to sabotage any autonomy deal.
For some of the Kurdish nationalist the steps envisioned in todays plan are no enough. They do not want autonomous mayors but their own state and they want it now. It is quite possible that parts of the PKK and other groups they will not follow Öcalan ceasefire order and continue their terror campaign.
Nationalist on both sides have proven their ability to spoil any deal. Both sides are capable of attacks on the other side but both may also use false flag attacks to spoil the ceasefire and renew clashes. Two earlier attempts of ceasefires did not work out.
When Kemal Attatürk formed the modern Turkish state out of the ruins of the Ottoman empire he disenfranchised two social groups because he believed they would endanger the secular and united state he attempted to create. Those two groups were the Islamists and the Kurds. With the recent developments in Turkey Attatürk's fears might now come true.