Air forces have carried out a fresh missile bombardment on rebel-held sections of Aleppo for the first time in three weeks, activists in the besieged city have said.
The British-based Syrian Observatory for Human Rights said the airstrikes struck three neighbourhoods.
There were no immediate details on casualties.
The Russian Defence Ministry has released footage of its military operation in Syria but did not confirm whether it has been targeting eastern Aleppo after the city was hit by fresh airstrikes.
The UK-based Syrian Observatory for Human Rights and other groups said airstrikes hit at least eight neighbourhoods in Aleppo, killing at least 10 people - the first such attacks for nearly a month.
The Syrian military confirmed its involvement in the new bombardment and according to reports, Russia also took part, using jets from the aircraft carrier which passed through the English Channel last month, as well as long-range missiles.
Russia's Defence Minister described Tuesday's activities as a "massive operation" but claimed it was concentrated on Idlib and Homs.
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