While the prospect of US -led military action that could lead to confrontation with Russian Federation hung over the Middle East, the White House accused Syria of carrying out a toxic gas attack on April 7 that killed dozens of people in the town of Douma, near Damascus.
Russian President Vladimir Putin said on Wednesday that he hopes "common sense" will prevail in an increasingly "chaotic" world.
He did not elaborate or name the state.
Trump's administration has sought to show toughness on Russian Federation, with a series of economic and diplomatic actions, including new sanctions last week against government officials and oligarchs.
"If there is a strike by the Americans, then.the missiles will be downed and even the sources from which the missiles were fired", Amb.
Russia's envoy Nebenzia called on the United States, France and Britain "not to bring the world to such a risky threshold".
The allegations and images of victims in hospitals sparked outrage and prompted the United States, France and the UK to consider a military response against the Syrian government.
The Russian leader warned against "ill-considered and unsafe actions ... that would have consequences beyond conjecture".
France and Russian Federation have instructed their defense and foreign ministers to maintain close contact in order to avoid an escalation of the situation in Syria, the Kremlin said on Friday.
U.N. Secretary-General Antonio Guterres says the Middle East is in such "chaos" today that it has become a threat to worldwide peace and security - and Syria "represents the most serious threat". Could this be the start of a new Cold War?More news: Mega Millions Jackpot victor announced
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After a purported chemical weapons attack in Syria, he allowed a USA missile strike on a Syrian air base go unanswered, apparently trying to leave the door open for better relations with Washington. "Russian Federation can complain all it wants about fake news, but no one is buying its lies and its cover-ups".
U.S. ambassador to the UN Nikki Haley greets her Russian counterpart Vasily Nebenzya before the Security Council meeting on Syria at the UN headquarters in NY.
"We have to know that there is proof and we have to know that we are taking every precaution necessary should we take action", she said.
"The Syrian government had been repeatedly warning for at least a month that rebels prepared to stage a provocation with chemical weapons in this very area".
Speaking to reporters in Moscow, Lavrov reiterated a strong warning to the West against military action in Syria.
He noted that the Russian and US militaries have a hotline to prevent incidents, adding that it's not clear if it would be sufficient amid mounting tensions.
Russian Federation is Syrian President Bashar al-Assad's most powerful ally.
The capture of Douma from rebels who evacuated this week has clinched a major victory for Assad, crushing what was once a center of the insurgency near Damascus, and underlines his seemingly unassailable position in the war.
More practically, at the United Nations, Russia´s diplomats vetoed a USA motion to re-establish an global investigation into chemical weapons use in Syria that could have established blame.
Inspectors from the Organisation for the Prohibition of Chemical Weapons are expected to arrive in Syria over the weekend to investigate the reported attack, following an invitation from Damascus. If true, the negotiations could suggest that Russia is ready to allow the strikes to go ahead largely unhindered, provided Russian forces are left untouched.