The Russians flew an IL-20M over Homs yesterday:
https://www.youtube.com/watch?v=9qwNY9GFXp8
Gathering intelligence for today's air strike.
There are several different "sides" in Syria.
Government + Iranians + Hezbollah
Islamic State
Kurds
Al Nusra
FSA and other rebels supported by the West.
The Turks have struck at least 3 of these.
West alliance supposedly only after IS.
Who are the Russians after?
This is a good source for updates on events:
https://twitter.com/EliotHiggins