Russian President Vladimir Putin has insisted that reports that Syrian forces carried out a chemical weapons attack are "unfounded" following international outrage at the attack in Idlib.
He said it was "unacceptable to make unfounded accusations against anyone until a thorough and unbiased international investigation" in a phone call with Israel's prime minister.
Turkey has said that initial post-mortem results suggest the nerve agent Sarin was used by Syrian forces in a strike that killed at least 86 people including dozens of children.
However Russia, a key ally to the Syrian leader, says that there is no proof of an attack by government forces and has said the West should not rush to apportion blame.
The US Secretary of State says president Assad should have "no role" to continue governing after alleged gas attack on his own people.
Survivor of alleged Sarin nerve agent blast says 22 members of his family alone were killed in attack condemned as an "affront to humanity".
A father lost his twin babies, his wife, brothers and other family members in a suspect chemical attack in Syria on Tuesday.