US President Barack Obama has expressed "deep concern" about the situation in rebel-held parts of Aleppo, amid an assault by Syrian government forces.
Medics in the city are struggling to cope with the huge number of casualties caused by the most sustained and intense aerial bombardment in years.
08:52 ISIS Destroys Facade of Roman Amphitheater in Syria’s Palmyra13
10:19 Kremlin hits out at Obama, says was always ready for nuclear arms cuts15
10:48 Russia takes parting shots at Obama, looks forward to Trump administration24
08:00 Lavrov: Russia invites Trump officials to Syria talks18