Erdogan says 'saddened' by US flags with Syrian YPG

President Recep Tayyip Erdogan on Sunday said Ankara was "seriously saddened" by footage showing American military vehicles operating close to the border with Syrian Kurdish fighters Turkey sees as a terror group.The Syrian Kurdish Peoples' Protection Units (YPG) are seen by Washington as the most effective fighting force in the battle against jihadists in Syria.Ankara says the fighters of the YPG are merely the Syrian branch of the Kurdistan Workers' Party (PKK), who have waged an insurgency si