The advanced S-300 Russian air defense system, which Moscow has pledged to deliver to Syria, could reach Hezbollah and beyond, a senior defense official warned on Saturday.Amos Gilad, head of the security-diplomatic branch of the Defense Ministry, told Channel 2, "These weapons are dangerous. If Hezbollah and Iran support Syria, why shouldn't they [the Syrians] transfer these weapons to Hezbollah? It's a threat to us, a threat to the Americans, and a threat to the Persian Gulf." Gilad's reference to the Persian Gulf appeared to be veiled warning that Syria could transfer the S-300 to Iran, which was supposed to receive a shipment of the batteries from Russia in 2010, before American and Israeli pressure scuttled the arms deal."Israel has to look out for the security of its citizens," he added.