U.S. Secretary of State says Assad is showing a lack of commitment to negotiations seen through the use of chemical weapons and involvement of Hezbollah fighters.

Soon, Washington will need to decide whether to order a Libya-style NATO intervention or let Syria bleed to death and figure out where Iran, with a new president, fits into the picture.

Russian FM Lavrov says move could ignite Mideast violence; U.S. says Assad regime used nerve agent sarin in the embattled city of Aleppo in March and April.

Western diplomats say U.S. considering imposing no-fly zone in Syria after obtaining proof that Assad regime used chemical weapons on rebels.

Hours after Obama administration pledges to support rebels, fighting intensifies in Syria's largest city.

U.S. decides to boost military aid for Syria's rebels after intel community asserts that Assad's forces used chemical weapons, including nerve agent sarin, repeatedly against opposition fighters; Russia says it is unconvinced by the claims.

The battle over the Quneitra crossing is critical from Israel's perspective, but it won't clinch victory for Assad. While Western and Arab states dither over whether to arm the rebels, it’s the aid that will determine the civil war's outcome.

Both government forces and rebels have used prohibited chemicals, France says.

Investigative team bases conclusion on interviews with victims, medical staff and witnesses, says there are indications rebels used such chemical weapons as well, though exact composition of weapons and identity of perpetrators cannot yet be verified.

Israel will not intervene in Syria as long as its security interests do not come under threat, says Moshe Ya'alon: he estimates the Russian S-300 systems will not be delivered to Assad's forces before 2014.