Oh I see but just think Nestorian Turks destroying the heathens of
Abbasids do you think an alliance beetween them and Byzzies is possible.
It's not impossible, but I think it's unlikely. If the Byzantines are under sustained Arab attack, then they'll pay anyone to attack the Arabs from the rear, but a long term alliance is implausible, given the distances involved. And even if the distances are closed somehow, by time Nestorian Turks reach the Byzantine frontiers in Syria and Armenia, they'll be seen as every bit as much as a heathen menace to the Empire as the Abbasids ever were.