Turkey's Biggest Enemy

i think it's strange, because a lot of people were watching when afrin and idlib were absorbed by turkey. But then this other border zone in a in rojava, or northeastern syria, was also invaded by turkish forces. And i what, what? What is holding back erdan's party, which is getting more ferocious by the day? The united states holds en. Policy toward syria. By backing the curds, america is backing turkey's biggest enemy.