From overflight requests and grainy photos of fighter jets to social-media posts showing Russian marines in Syria, there are mounting signs that Moscow may be ramping up its military presence in the war-torn Middle East nation.
As Western governments struggle to grasp the extent of Russia's involvement in the Syrian civil war, a more pertinent question is sometimes obscured: What does Russia want?
11:57 Russians march to remember slain opposition leader Nemtsov14
14:07 Iraqi jets strike Islamic State in Syria for first time as troops advance in Mosul20
13:41 In Syria, car bomb kills scores in area recaptured from Islamic State17
12:32 Islamic State car bomb kills dozens in northwest Syria20