istanbul turkish president tayyip erdogan friday hail attack unite state syrian air base positive development say enough serious step need protect syrian people unite state fire cruise missiles early friday syrian base president donald trump say deadly chemical weapons attack launch mark first direct u.s. assault government bashar al-assad six years civil war find positive concrete step take war crimes assad regime enough find enough time take serious step protection innocent syrian people erdogan tell rally southern province hatay international community capability stop regime terrorist organizations hope active stance unite state display idlib begin regard developments erdogan say turkey 's erdogan say u.s. attack syria 'positive enough