Turkey's bombing campaign in Syria and Iraq is the last thing we need in the fight against Isis

Turkey’s president, Recep Tayip Erdogan, is playing a dangerous game of divide and conquer, both at home and in the region. Having spent the best part of the conflict in Syria acquiescing to Isis – which has been using Turkish territory as a transit point into Syria, and using it to build a lucrative commercial hub – Turkey has started targeting the jihadis in Syria.