For Turkey the Syrian civil war has been disastrous. Five years ago, when peaceful protest against Syrian president Bashar al-Assad began as part of the Arab Spring, Turkey looked set to benefit most from the anticipated regional shift. Now, Turkey's move across its southern border represents a failure, writes Dr Christopher Phillips. Dr Phillips new book The Battle for Syria: International Rivalry in the New Middle East is out now.More »Also featured on BBC Radio 4 (The Briefing Room)