Moscow will bolster Syria's air defence with a S-300 system and jam radars of military planes striking from off the coast of the Mediterranean following the downing of a Russian plane, its military chief said.
Defence Minister Sergei Shoigu said that President Vladimir Putin has ordered additional security measures after a Syrian Soviet-era S-200 air defence missile shot down a Russian military plane by mistake, killing 15, in an incident last week that Moscow blames on Israel.
"This has pushed us to adopt adequate response measures directed at boosting the security of Russian troops" in Syria, Shoigu said in a televised statement.
"(Russia will) transfer the modern S-300 air defence system to the Syrian armed forces within two weeks."
Syrian military had already been trained to use the system, which was set to be sent over in 2013 but was held up "at the request of Israel," Shoigu said.
"In regions near Syria over the Mediterranean Sea, there will be radio-electronic suppression of satellite navigation, on-board radar systems and communication systems of military aviation attacking objects on Syrian territory."
Moscow says Israeli F-16 planes which struck Latakia in western Syria on September 17 later used the landing Russian Il-20 surveillance plane as a "cover," which resulted in the Il-20 being struck by a Syrian air defence missile.
"We are certain that the realisation of these measures will cool the 'hot heads' and will keep them from poorly thought-out actions which threaten our servicemen," Shoigu said.