""The Western claim that the Russians were not fighting Isis but focused on eliminating a mysterious “moderate” opposition, which was said to pose a great threat to Assad, was always something of a propaganda slogan. In reality, the Russian aircraft attacked all armed opposition groups threatening Assad. These were primarily al-Nusra and Ahrar al-Sham in the north-east, Jaish al-Islam close to Damascus and IS further east. It was a convenient myth for the Syrian opposition and its outside backers to claim that neither the Syrian army nor the Russians were fighting Isis."" (thanks Amir)