Russian UCAV's in Syria?

I was just wondering if Russia has any armed UAVs it can/is operating over Syria?
Something like a Predator or Reaper class equivalent.
In cost alone such aircraft would be interesting alternative to get bombs and missiles onto targets, compared to the fuel guzzling Sukhoi’s.
Plus operationally they can stay on station for much longer, gathering intel and waiting for the perfect moment to strike a target.

Is Russia working on anything like that?
Another aspect is that armed Chinese UAV’s are now being used by Saudi Arabia, Nigeria, Pakistan and Iraq.
Considering the close military ties between Russia and China, why hasn’t Russia bought any Chinese UAV’s?