Islamic State militants launched a new attack on the besieged city of Deir el-Zour today - in the most fierce fighting in a year, the Syrian government and opposition activists said.
Syrian President Bashar Assad is prepared "to negotiate everything" at talks set to begin in Kazakhstan, as he seeks to cast himself as a peacemaker after his forces recaptured Aleppo last month.
The death toll in the car bomb attack on a busy market in a Syrian rebel-held town along the Turkish border today has risen to 43, activists and rescue workers said.
At least 15 people were killed when a car bomb went off in a busy market in a Syrian rebel-held town along the Turkish border, Syria's opposition activists and rescue workers said.
Syrian government and opposition forces fighting over the strategic Barada Valley have agreed a temporary ceasefire, according to a media arm of Hezbollah.
Russia has announced it is withdrawing its aircraft carrier and some other warships from the waters off Syria as the first step in a reduction of its forces in the war-torn Middle East country.
Turkey has warned that repeated ceasefire violations by Syria's government are threatening peace talks scheduled for later this month.
Residents of Damascus are scrambling for clean water after the government attacked rebels holding the city's main source in a nearby valley, leading to an accidental outage that has stretched on for nearly two weeks.
Syrian government forces are pressing an offensive in a valley north west of Damascus as 10 rebel groups suspended talks on planned peace negotiations because of what they described as government violations of a ceasefire deal.
The UN Security Council unanimously adopted a resolution supporting efforts by Russia and Turkey to end the nearly six-year conflict in Syria and jump-start peace negotiations.
Besieged opposition pockets around the Syrian capital of Damascus have seen no reprieve in fighting despite a nationwide ceasefire agreement which went into effect more than 36 hours ago, activists said.
Vladimir Putin has announced it will begin at midnight on Friday.
A nationwide ceasefire between Syrian government forces and opposition rebels has come into effect.
The ceasefire agreement brokered by Russia and Turkey and approved by the Syrian government and some of its most powerful rebel opponents is a potential turning point in the Syrian civil war.
Turkey and Russia have reached an agreement on a plan for a ceasefire comprising the whole of Syria, Turkey's state-run news agency said.
Russian troops have discovered mass graves in Aleppo with bodies showing signs of torture and mutilation, said the Russian Defence Ministry.
Several hundred peace activists have started what they say will be a months-long protest march from Berlin to war-ravaged Syria to urge an end to the fighting there.
Syrian army experts are dismantling explosives and booby-traps left behind by rebels before they left the last neighbourhoods they held in the northern city of Aleppo, according to state TV.
The city of Aleppo has returned to government control, a statement by the Syrian armed forces says - ending a four-year rebel hold over parts of the city.
The final phase of evacuations from former rebel strongholds in eastern Aleppo are under way.