Turkey has sent shock waves through the Middle East by preparing plans to send troops into Syria for the first time, turning the civil war into an international conflict on Europe’s borders. President Recep Tayyip Erdogan has authorised a change in the rules of engagement agreed by the Turkish parliament to allow the army to strike at Islamic State of Iraq and the Levant (Isil), as well as the Assad regime, according to local newspapers. The aim is to establish a buffer zone for refugees and against Isil, but Mr Erdogan has also suggested that the main target of the...