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The Russian defence ministry said the pilot had ejected into an area believed to be controlled by the jihadist Hayat Tahrir al-Sham alliance.
Although he survived the crash he was killed in a ground fight, Moscow said.
Hayat Tahrir al-Sham - formerly linked to al-Qaeda - said it had shot down the plane.
The Syrian government, backed by Russian air power, launched a major offensive in December against rebel groups in Idlib.
