However, more of the most advanced of these, the Su-34, codenamed Fullback by Nato, have been replacing older aircraft.
Operations by Turkey, meanwhile, have been overwhelmingly against the Kurds rather than Isis.
Western defence officials also contend that the Russians are hitting other rebel groups in the guise of attacking Isis and that they are more indiscriminate in their targeting because they are less sensitive to any evidence of civilian casualties and because of their lack of precision-guided weaponry.
His intervention in Syria has been a game changer and what happens there now lies, to a large extent, in his hands. The Russians are allying with the Kurds, unfazed by the Turkish anger this has provoked.
And, crucially, they are now returning to Egypt to an extent not seen for 44 years, since they were kicked out by President Anwar Sadat.
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