COSTELLO: ISIS suffers another military setback in Syria. The Syrian military says it has regained control of the ancient city of Palmyra in Central Syria. Syria credits Russian airstrikes for helping drive the militants out of that city. ISIS fighters have been in control of Palmyra since last May. During that time they under took a campaign to destroy the area's cultural relics. CNN senior international correspondent, Arwa Damon, is in Istanbul with more. Hi, Arwa.</s>ARWA DAMON, CNN SENIOR INTERNATIONAL CORRESPONDENT: Hi, Carol. Perhaps the most iconic of all that was destroyed was the entrance to the ancient city of Palmyra itself, the Arc of Triumph. That along with millennia old temples as well as centuries old other installations that made up Palmyra all destroyed by ISIS. Now the exact extent of the damage at this point in time is unclear. Regime forces according to state television only just recently in the last day or so regaining control of the city and of the ancient UNESCO heritage site. This was because as you mentioned there, Russian support, pounding various different ISIS locations and fighting positions over the last few days with hundreds of air strikes, which then allow the Syrian government forces along with the militias that support them to move in and regain control. This is strategic on the one hand, yes, because of where Palmyra is located on the main road between the western province of (inaudible) and the eastern ISIS stronghold of (inaudible). But also very --
ISIS Retreats As Syrian Troops Reclaim Palmyra.