"All flights by Russian and Syrian air forces have been completely halted in a 10-kilometre zone around Aleppo since October 18," senior military official Sergei Rudskoi said at a briefing yesterday.
"The moratorium on air strikes by Russian and Syrian planes around the city will be extended," he added, without specifying a timeframe.
A so-called "humanitarian pause" declared by Damascus and Moscow ran out at 1600 GMT on Saturday, and the Syrian Observatory for Human Rights reported there were air strikes afterwards against the opposition-controlled district of Sheikh Saeed.
Moscow had on Monday ruled out early moves to renew its total ceasefire in Aleppo after the brief halt ended, admitting that few people had used humanitarian passages to leave the city and blaming failures by the US-led coalition.
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Russian Foreign Minister Sergei Lavrov yesterday urged the United Nations to do more to facilitate the evacuation of the injured from the battered city.
In a phone conversation with his German counterpart Frank-Walter Steinmeier, Lavrov "stressed that representatives of the UN's humanitarian agencies should act in a more resolute manner to remove the obstacles" preventing aid from getting in to eastern Aleppo and those injured from getting out, the Russian foreign ministry said.
More than 250,000 people are still living in the besieged area.
For its part the UN on Monday criticised Syrian forces and rebel groups for failing to organise evacuations during the ceasefire window.
Russian and Syrian planes had stopped bombing from the air on Tuesday last week ahead of the ceasefire.
The West has accused Moscow of perpetrating potential war crimes in Aleppo through indiscriminate bombing in support of a regime offensive to retake total control over Syria's second city.