Area in Damascus has been under siege for four years with over 140,000 civilians displaced in fighting.
The EU is eager to safeguard the pact, under which Tehran agreed to curb its nuclear ambitions for at least a decade, but United States President Donald Trump has been a fierce critic.
Russian Foreign Minister Sergei Lavrov denied that Moscow had interfered with any evidence.
“There are two things that the West and the Zionists want. One is that there be no unity in the [Arab] nation. The other is that [the Arab nation] not arm itself with science and knowledge."
An analysis on what the repercussions of the US strikes in Syria might mean for the use of chemical weapons in smaller states.
Nagel: Israel will not tolerate a permanent Iranian military presence in Syria.
Haley acknowledged regional concerns and said, “We all know our work in Syria is not done.”
"We renew our strong condemnation of terrorist acts carried out by Iran in the Arab region."
Yatom says the Iranian drone Israel shot down was an exact replica of a US drone that fell in Iran.
Russia, which is helping Assad fight rebel forces opposed to his rule, immediately condemned the strikes.
On the eve of the US, British and French missile strikes on Syria, opposition activist Abdollah Awad said "Assad is Iran's man."
At each turn, Turkey has sought to both urge caution and present itself as a peaceful partner.
Damascus and its allies have said reports about poison gas in Douma were fabricated as a pretext for Western strikes.
Israeli politicians agree US action is a step in the right direction.
Theresa May said the aim was to deter the Syrian authorities from further use of chemical weapons and to send a message to the wider world that it was unacceptable to use such weapons.
The US-led strikes in Syria were designed to send a message of deterrence. Is the regime deterred?
The US-led strikes were a response to a suspected chemical weapons attack on the Syrian town of Douma last weekend which killed dozens of civilians.
Allegations of Bashar Assad's chlorine use are frequent in Syria's conflict, raising questions about whether Washington had effectively lowered the threshold for military intervention.
US, UK and France announce joint strike on Assad regime chemical weapons facilities.
According to the statement by the army, the conclusion was made following an analysis of the airfield, and operational and intelligence research carried out on the remaining parts of the drone.