Turkey invaded Syria on Wednesday aiming primarily at the Kurdish YPG.

The YPG militia has been a key US ally against IS and controls swaths of northern Syria; Turkey considers YPG a terrorist organization.

As Turkish forces moved towards Jarablus on the banks of the Euphrates river their stated objective was to deny IS control of the border town; their unstated objective was to ensure Jarablus would not fall under the control of the Kurdish militia, paving the way for an autonomous Kurdis...