By Saturday, regime soldiers were within 500 metres of the road and firing on any vehicle attempting to use it
Russia had proposed joint air strikes with the US against jihadist targets in Syria in May
Rebels launched a counter-offensive, leading with two car bombs to open the vital Castello road to eastern Aleppo
Putin also called on Obama to help aid the separation of moderate opposition groups from "terrorist groups like the Al-Nusra front"
The statement did not specify whether the ceasefire extended to military actions against ISIS
In a statement, the military had pledged that the attack on its pilot will not go unpunished
An eyewitness said that the suicide bomber "detonated himself near our checkpoint after he couldn't reach his real target, Patriarch Ignatius".
The first explosion was the result of a car bomb in al-Teen street and the second blast, the cause of which remains unclear, took place at the entrance of Ziabiyeh district
Foreign capitals have asked the World Food Program to plan an air bridge to save thousands of Syrian civilians facing starvation
UN had requested access to 34 locations to help 1.1 million people and Syria approved 23 requests in full, six partially, while rejecting five
It was the first time that government troops had entered Raqa province since they were ousted by IS fighters in August 2014
A truce agreed by Russia and the United States in February has been violated nearly continuously around Aleppo
The Castello road, where a bus was also hit by regime bombing raids, is a key rebel supply route out of divided Aleppo
Russian air strikes killed at least 11 civilians in Aleppo province, while 15 civilians were killed in Idlib province
According to the UN, a total of 592,000 people live under siege in Syria
Moscow has been carrying out an air campaign in support of its Damascus ally since September last year
Cited failure of the Geneva negotiations and the continued shelling of rebel-held areas by President Bashar al-Assad's regime as reasons for resignation
Another 38 died in four bombings, three of them suicide blasts, in Jableh further north
Putin surprised the West in March when he ordered the "main part" of his forces to pull out of Syria, where Moscow has been conducting a bombing campaign
The announcement came as Russia and the US agreed to boost efforts to find a political solution to Syria's five-year war