<br/>Russian and Turkish jets have carried out their first joint strikes on so-called Islamic State (IS) inside Syria. The Russian Defence Ministry said IS was targeted in the suburbs of the town of al-Bab, Aleppo province, where Turkey suffered heavy casualties last month battling the group on the ground. <br/><br/>A Russian spokesman, Lt-Gen Sergei Rudskoi, said the joint action had been highly effective. Russia and Turkey have become leading outside players in Syria's civil war. <br/><br/>Al-Bab, about 20 kilometres from the Turkish border, has been the focus of a five-month Turkish campaign aimed at pushing back both IS and Kurdish forces.<br/>'''<br/><br/>