For now it's probably best to keep a low profile and not actively interfere. Keep the focus of Iranians to their own society. The mullahs need a diversion from this mess and being able to blame external enemies & foreign media for instigating this fight would be divine intervention for them. Don't give them that boogey-man, this is a self-inflicted internal problem. If they fear a loyalist like Moussavi then the mullahs are really losing touch with reality.