S-300 air defense missile complex has been deployed in Syria again for the purpose of defending Russian troops and rebuffing any threats that may come from terrorists, the Syrian ambassador to Russia, Riyad Haddad told Rossiya 24 channel on Thursday.

"S-300 complex is really deployed in Syria," he said.

"Its deployment there pursues the goal of assuring the security of Russian troops that are in Syria and helping the Syrian Army to fight with terrorism."

Thus the S-300 "also helps the Syrian Army to defend itself from any threats that may come from the terrorists," the ambassador said.