Syrian and Russian jets are stepping up strikes on opposition forces in northern Syria in retaliation for the sudden offensive that has cost the autocratic regime control of the country’s second largest city,

As things stand this morning, the Syrian army says that anti-government forces have now taken control of "large parts" of Aleppo. Meanwhile, the country's president is vowing to "defend [Syria's] stability and territorial integrity in the face of all terrorists and their backers".

Syria's civil war has taken a dramatic turn, with dictator Bashar Assad once again leaning on Russian support after a shock offensive by Islamist rebels in Aleppo.