Defenses. the reason it has avoided those air defenses is precisely because it has posed no threat to the regime. the regime has air defenses. the u.s. can fly in aircraft to attack isis and get out without playing spoiler. the fight against isis will suffer. >> i disagree with that approach. it doesn't match up with actions on the ground. there have been multiple occasions when the united states air force has threatened syrian or russian air force when they felt their interests on the ground were threatened. or even syrian kurdish forces which are proxys to the united states, whenever those h...