Assad

With help of Russia and Iran, Damascus has shored up its rule over much of the country's populated west

Syrian president dismissed the allegation that his regime perpetrated the attack that left 87 civilians dead

Fifty-nine US missiles struck a Syrian air base in retaliation for Syria's alleged chemical attack

Sean Spicer defended the statement by saying it had been written in part by a Jewish staff member

Iran and North Korea have slammed Washington's retaliation and put it on a diplomatic collision course with Moscow

G7 efforts to build a united front against Assad comes just ahead of Tillerson's trip to Moscow

More than 320,000 people have been killed in Syria since the conflict erupted in March 2011

Rouhani called on Saturday for an impartial investigation of this week's suspected chemical weapons attack

Washington's first priority is the defeat of Islamic State

Moscow said it would 'halt' its deal with the US to avoid clashes in Syrian airspace