Putin told his Iranian counterpart Hassan Rouhani, also an Assad ally, that any new Western strikes in Syria would provoke "chaos in global relations".
"Vladimir Putin, in particular, stressed that if such actions committed in violation of the U.N. Charter continue, then it will inevitably lead to chaos in global relations", the Kremlin statement said.
When asked by a reporter on Friday if there would be more strikes, Mattis said, "That will depend on Mr. Assad, should he decide to use more chemical weapons in future. but right now, this is a one-time shot, and I believe it has sent a very strong message to deter Assad from doing this again".
British foreign minister Boris Johnson said the Syrian war would continue despite the "successful" strikes, saying the "overwhelming purpose" of the mission was to respond to repeated chemical attacks.
The Western countries blame Assad for the Douma attack that killed dozens of people.
Assad also declined to comment on calls by the US State Department to declare alleged Syrian stockpiles of chemical weapons, Zheleznyak said.
Responding to Haley's remarks about the plans for new sanctions, Evgeny Serebrennikov, deputy head of the defence committee of Russia's upper house of parliament, said Moscow was ready for the penalties, according to RIA news agency.
According to Reuters, a number of chemical factory facilities have been struck by missiles from US, British and French military personnel.
The inspectors were due to attempt to visit the Douma site. It was not clear when the visit would take place. "And we were able to repel it with Soviet missiles from the 70s", Russian lawmaker Dmitry Sablin quoted Assad as saying, TASS reported.
The US-led strikes were the biggest worldwide attack on President Bashar al-Assad's regime since the start of Syria's seven-year war. U.S. President Donald Trump said the operation was in response to the "evil and despicable" attack last Saturday on civilians.
The United States and Russian Federation delivered drastically different accounts of the results of US -led bombings of Syrian facilities that Washington called the "very heart" of Syria's alleged chemical-weapons program.
"The American (military) knows well that going towards a wide confrontation and a big operation against the regime and the army and the allied forces in Syria could not end, and any such confrontation would inflame the entire region", Nasrallah said.
Since a suspected chemical attack was reported on April 7 against a rebel-held enclave east of Damascus, U.S. and Western allies threatened to launch a military action against the Syrian regime, but not its allies; Moscow and Tehran.
"Negotiations on the draft resolution are set to begin on Monday, but diplomats said it remained unclear when the council would vote on the proposal", AFP informs.