More of an update; a paper from an Israeli think tank and the closing judgement in the opening summary:
In our assessment, Safavi's remark about Nasrallah's being a soldier of Khamenei was a threat against Israel. Its subtext read that Hassan Nasrallah could not have independent considerations when it came to strategic issues of Iran's national security, and that Hezbollah's large arsenal of rockets (60k) would, when necessary, be used according to a decision made by Iran. Such a decision could be made, for example, to respond to an attack on Iran's nuclear facilities.
Link:http://www.terrorism-info.org.il/en/article/20351