"Warplanes from the international anti-jihadist coalition carried out four air strikes today against Syrian forces surrounded by the Islamic State group in the Deir Ezzor air base," the army said in a statement.
"Sixty-two Syrian soldiers were killed and a hundred others were injured in these strikes."
The Russian military said two F-16 and two A-10 jets flew into Syrian air space from neighbouring Iraq to carry out the strikes.
"If these strikes were due to an error in the target coordinates, that would be a direct consequence of the US' refusal to coordinate with Russia its fight against the terrorist groups in Syria," it said.
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