Azaz - a focus of growing tensionpublished at 12:46 Greenwich Mean Time 15 February 2016
Russia has been carrying out air strikes since September against opponents of Syrian President Bashar al-Assad, although it says it has only targeted "terrorists".
In recent weeks, Azaz and the nearby Bab al-Salam border crossing have seen an influx of tens of thousands of people fleeing a major offensive by Syrian government forces on rebel-held areas to the south, outside the city of Aleppo.
A Kurdish militia, the Popular Protection Forces (YPG) has also been making advances against the rebels west of Azaz. Turkey, which considers the YPG a branch of the outlawed Kurdistan Workers' Party (PKK), has promised the "harshest reaction" if Kurdish forces try to take the town.