Rebel shelling in Syria's battered northern city of Aleppo killed 12 people including a child on Wednesday, state media said.
Russian Foreign Minister Sergei Lavrov on Monday rejected his German counterpart's call for a ceasefire longer than the current three hours daily to allow humanitarian aid into the Syrian city of Aleppo.
Syrian and Russian warplanes have launched a wave of air strikes in northern Syria, killing dozens in areas held by a rebel alliance battling to take control of second city Aleppo.
Russian air strikes on the Islamic State group bastion of Raqa in northern Syria on Thursday killed at least 30 people, including 24 civilians, a monitoring group said.
Syrian regime forces and rebel factions sent hundreds of reinforcements to Aleppo on Monday as opposition fighters announced an all-out offensive to take the country's second city.
Sporadic clashes hit the southern edges of Aleppo on Sunday morning, a monitoring group said, hours after rebels said they had broken a three-week government siege of the Syrian city.
More than 500 rebels and government forces have been killed in one week of fierce fighting to control the northern Syrian city of Aleppo, a monitor said on Saturday.
The world's chemical weapons watchdog Wednesday voiced concern over reports of a chlorine gas attack near the battleground Syrian city of Aleppo.
The Syrian regime's key ally Russia launched heavy air strikes overnight on the outskirts of divided Aleppo city, slowing a "last-chance" assault by rebels seeking to break a government siege.
Aid agencies called Friday on Syria's government to end its encirclement of rebel-held east Aleppo as a handful of civilians managed to use humanitarian corridors to flee the ruined city.
Syrian President Bashar al-Assad on Thursday offered an amnesty to armed rebels battling his forces if they surrender, the official SANA news agency reported.
Syrian government air strikes and artillery fire killed at least 16 civilians on Wednesday in rebel-held neighbourhoods in the east of Aleppo city, a monitor said.
