The "boots on the ground" are getting some help -
Syria conflict: Russia sends missile system to Tartus base - BBC News
Russia sends missile system to Tartus base
Russia has confirmed it has sent an S-300 air defence missile system to its naval base in Syria's port of Tartus.
Defence ministry spokesman Igor Konashenkov said the purpose of the system was to guarantee the security of the base from the air.
The deployment of S-300 surface-to-air missiles (known to Nato as the SA-23) to Russia's naval base at Tartus is the first time this system has been deployed outside Russian territory. It joins another sophisticated anti-aircraft system, the S-400, already in place at the Russian air base near Latakia.
The S-300 is highly mobile - its radars, launchers and command systems carried on a number of tracked vehicles. It can be mounted on a heavy wheeled launcher as well.
It is one of the most lethal area defence systems ever developed intended to engage aircraft, cruise and ballistic missiles.
Its deployment indicates that Russia is significantly bolstering its air defences in Syria. This is a clear signal to Washington that there would be a heavy price to pay should the US be tempted to intervene in some way against Russian or Syrian operations.