"During call to Russia FM Lavrov I reinforced concern over their action in Syria. Russia must use its influence to stop assault on Aleppo. Also urged Russia FM Lavrov to address humanitarian situation in Syria and allow aid into Aleppo," Johnson wrote.
In October, a humanitarian pause was introduced in Aleppo to ensure the safe evacuation of civilians and unarmed militants from eastern parts of the city through designated corridors. That pause collapsed when the militants from the Jabhat Fatah al Sham, previously known as al-Nusra Front attacked civilians, preventing them from fleeing the city.