Three Turkish soldiers have been killed and eleven more injured after a miscommunication caused a Russian jet to fire on their location in northern Syria.
The Syrian government has agreed to a ceasefire deal with rebel groups across the country, Russian President Vladimir Putin has announced.
The Syrian government has suspended the evacuation of civilians and fighters from opposition-held eastern Aleppo, blaming the rebels for breaking the ceasefire.
An operation to evacuate civilians and rebel fighters from besieged east Aleppo is under way.
At least 20 people, including many schoolchildren, have been killed in air strikes on a village in the north-western Idlib province of Syria.