Global inspectors are trying to visit the site of a suspected gas attack which brought US-led missile strikes on Syria and heightened the diplomatic confrontation between the West and President Bashar al-Assad's main ally Russian Federation.
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.
Earlier Saturday morning, the United States, in cooperation with Britain and France, attacked Syrian military facilities allegedly related to Syria's chemical weapons capabilities.
Referring to the US-led strikes in Syria, Putin said, "If such actions committed in violation of the U.N. Charter continue, then it will inevitably lead to chaos in worldwide relations".
The conversation came after Putin and his Turkish counterpart Recep Tayyip Erdogan agreed during a phone call on Saturday to make efforts to find a political solution in Syria.
Putin also emphasised the development of comprehensive cooperation between Tehran and Moscow, especially in economic and commercial sectors, and said: "In the current situation, it is essential to use all potentials and capacities to deepen relations between Iran and Russia".
But the USA envoy to the global watchdog said on Monday Russia may have tampered with the site of the incident on April 7 in Douma outside of Damascus.
The Western countries blame Mr Assad for the Douma attack, which a Syrian medical relief group said killed dozens of people.
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Britain's Ambassador Peter Wilson said at a news conference in The Hague that the United Nations had cleared the inspectors to go but they had been unable to reach Douma because Syria and Russian Federation had been unable to guarantee their safety.
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.
"This is not about regime change".
Asked about US-Russia relations, US ambassador to the United Nations Nikki Haley said ties were "very strained" but that the United States still hoped for a better relationship.
Although U.S. President Donald Trump had declared: "Mission accomplished" after the strikes, U.S. Lieutenant General Kenneth McKenzie at the Pentagon acknowledged that elements of the program remained and he could not guarantee that Syria would be unable to conduct a chemical attack in the future.
Speaking on Fox News on Sunday, Haley listed three aims for the United States: ensuring that chemical weapons are not used in any way that poses a risk to U.S. interests, that so-called Islamic State group is defeated and that there is a good vantage point to watch what Iran is doing.
Russian agencies quoted the lawmakers as saying that Assad was in a "good mood", had praised the Soviet-era air defence systems Syria used to repel the Western attacks and had accepted an invitation to visit Russia at an unspecified time.