Under an initiative of the Iranian side, on April 15, a phone conversation took place between the presidents of Russian Federation and Iran, Vladimir Putin and Hassan Rouhani.
Russia's United Nations envoy, Vassily Nebenzia accused the U.S. and its allies of "hooliganism" and "cynical disdain" after they acted without waiting for the results of an investigation into the Douma incident.
On Saturday, the U.S., U.K., and France launched airstrikes on the Assad regime's alleged chemical weapons facilities in Syria.
"It is long overdue that this council condemns the Syrian government for its reign of chemical terror and demands global accountability of those responsible for these heinous acts", US Ambassador Kenneth Ward said in comments seen by Reuters.
In London and Paris, British Prime Minister Theresa May and French President Emmanuel Macron faced criticism from political opponents over their decisions to take part in the air strikes against Syria.
The inspectors were due on Monday to attempt to visit Douma, but the British delegation to the OPCW said they had not yet been granted access, citing the agency's director general.
Pointing out that the United States and some Western countries do not want Syria to be easily stabilised, the president said: "We need to increase our speed in order to solve the Syrian crisis, and in this regard, the Islamic Republic of Iran is ready to cooperate with Russian Federation within bilateral and trilateral frameworks". The Syrian leadership denied any involvement in the attack and invited the experts from the Organization for the Prohibition of Chemical Weapons (OPCW) to investigate the reports.
The ties between the USA and Russian Federation were at standstill for the last one year and further deteriorated after the US-led strikes in three Syrian cities in response to a suspected deadly chemical attack in the town of Douma.
Meanwhile, the U.S. has said it is preparing to increase pressure on Russian Federation with new economic sanctions.
The Western allies have said the aim was to prevent the further use of chemical weapons, not to intervene in the civil war or topple Mr Assad.