The international community is demanding UN access to the site of an alleged chemical attack in Syria.
As tensions rise between Ankara and Moscow, attention has shifted to an obscure ethnic group in the Middle East: the Turkmens of Syria. But who are the Turkmens and how do they fit into the ongoing war in the region?
The US has slapped sanctions on a number of individuals accused of supporting Syria's government. The blacklisted names include a "middleman" who buys oil from "Islamic State" and the head of the World Chess Federation.
British PM David Cameron is expected to seek Parliament's approval to launch attacks on the "Islamic State" in Syria. President Bashar al-Assad, meanwhile, has credited Russia for his army's advances against rebels.
Russia plans to hit the "Islamic State" (IS) hard, but will it have the desired effect? Fiona Clark looks at some of the challenges at home and in Syria and what could be a Pandora's box for the Russian bear.