Proffesor Murat Yesiltas, the member of Sakarya University Middle East Institute, wrote an well organized paper on latest Turkish operation against PYD in Afrin.
” Following Operation Euphrates Shield (OES), Turkey brought a new dimension to its military activity in Syria in order to minimize the PKK’s strength in northern Syria and to “de-territorialize” the terrorist group in the middle term. With the Afrin operation, the aforementioned military activity has spread in a wider geographical area in the western flank of the Euphrates.
The operation, which had been in preparation phase for a long time, started on January 20 with the offensive phase, short after President Erdogan’s “Afrin operation has actually started on the ground” statement.
While the Turkish Armed Forces (TAF) declared the name of the operation as “Olive Branch,” it made reference to decisions made by the UN Security Council’s decisions with regards to the war on terror and ‘self-defence’ element in Article 51 of the UN Charter – as it did in OES.
There are a number of push factors that shape Turkey’s strategy towards the PKK’s presence in northern Syria. However, for now, Turkey will try to actualize the strategy differently in two geographical areas. Turkey’s first goal is to minimize the PKK’s presence and capacity and force it to withdraw from the areas it controls in the western flank of the Euphrates. …”