The Turks have forfeited their role as an impartial mediator. Their petulant outbursts and continued sniping have shown that they are not impartial and are hostile to the state of Israel. They no longer serve any useful purpose in potential peace talks.
Syria insurgents recapture town in Aleppo province from army (AP)
from the article: Lieberman: After all the insults, Turkey can't mediate Syria talks