The negotiations between the Syrian government and the Saudi-backed High Negotiations Committee hit an impasse after the HNC quit the negotiating table over what it called violations of the ceasefire by the Syrian troops.

If the US does not get its way in Syria, it will organize a new surge in violence there, says an analyst.

Obama has warned that a fragile ceasefire in Syria is in grave danger of collapsing.

Russian military forces are preparing for a ground offensive in Syria, says a US military official.

There are no secret talks between Russia and the US on Syria, Lavrov says.

The chief negotiator of Syria's so-called opposition urges attacks on government forces.

Syrian army soldiers, backed by Hezbollah fighters, launch a fresh operation to liberate the northern areas of the strategic city of Aleppo.

The US wants Assad to be removed through a “Plan B” that includes providing anti-government militants with heavy weaponry, says an analyst.

Russia denies reports that it has reached a deal with the US over the fate of Syrian President Bashar al-Assad as part of efforts to end the crisis in the Arab country.

A Russian coordination center for reconciling warring parties in Syria says the ceasefire there has been violated nine times in the past 24 hours.