fox that they are watching these matters closely and there has been no delivery s 300 is an advance air to surface missile mobile and difficult to protect and defend against. it would make it more difficult western allies to set up a no-fly zone. israel has threatened to take military action if those russian missile shipments were made. chairman of the joint chiefs general martin dempsey explained earlier this month why the u.s. would consider delivery of the russian s-300 a game chamber. >> -- changer. >> what i really worry about since assad decides he has got these systems he is somehow safer or more prone to a miscalculation. so, you know, again, an unfortunate decision. >> meanwhile, syria is deeply divided opposition is calling for help from the town of where battling