russia for supporting the syria president bashar assad. russia someone of syria's last allies and has rejected all united nations efforts to take action against the aassad. leland vittert with the news live from our middle east bureau. leland, why why don't the rebels want to negotiate? >> quite frankly, right now, harris, they don't have to. time is is on their side. momentum son their side. they are beginning to tighten the noose on president assad. especially around his capital damascus. secondly the rebels don't really believe the russians. they don't trust them as honest brokers and perhaps that's with good reason. rebel videos uploaded to youtube show russian made bombs uploaded. this is a boom fired on cities aleppo with the russian writing clearly visible on the weapon's fenn. most bombs though explode like this one caught on amateur video yesterday as it was dropped from a low-flying