Does the Russian Air Force Even Know What Is Going On in Syria?
War Is Boring
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You are forgeting one mayor factor so called Russia US cooperation where certain groups were not targeted because of US claiming they are good moderate beheaders.

We could write a similar article on why ISIS oil convoys were never attacked till Russians did it. Or why ISIS convois move trough iraq and syria under US watch .

Remember Russians are operating a small expeditionary force of airplanes for 1 year , while US led ‘coalition of moderate beheader suporters’ has run the show for last 5 year with no effect against ISIS