The Portuguese diplomat reported that a mission of the Organization for the Prohibition of Chemical Weapons (OPCW) has already arrived in Syria to clarify the facts of the alleged use of chemical weapons and soon, a second team must be added.
The UN's Secretary General has said the Cold War is "back with a vengeance".
He warned that the crisis over Syria is a return to the Cold War, and increasing tensions are leading to a military escalation.
Nebenzia said the United States' "consumeristic" approach to the UNSC and repeated "reckless conduct in encroachment of sovereign states and worldwide law" was "unworthy" of its membership to the global organisation.
"On the contrary, young people's resilience is transforming local communities while combating extremist movements", she said.
Russian Federation vetoed a U.S. draft on Tuesday, which would have established a new investigative mechanism for one year - as well as identify those responsible for the use of chemical weapons.
Pierce said the cabinet met recently and concluded that the "Assad regime" has a track record of using chemical weapons. "So the situation is very risky", Nebenzya said.
"France will shoulder its responsibility to end an intolerable threat to our collective security", Delattre told the Security Council. The United States is consulting with Britain and France about a joint military response to an alleged toxic gas attack in Douma that medics and rescuers said left at least 40 people dead on Saturday.
And he said the safeguards and mechanisms that managed the risk of escalation between the US and the Soviet Union in the past "no longer seem to be present".More news: Blood Samples Show Nerve Agent, Chlorine Used in Syria Attack
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Trump's bellicose tweets came in response to a warning from Russia's ambassador to Beirut, who took to a television network run by the armed group Hezbollah to declare that any USA missiles would be shot down "as well as the sources they were fired from".
"It seems that with the latest developments, the atmosphere has eased somewhat", Erdogan told reporters in Istanbul.
Mattis said no decision had been made about carrying out missile strikes.
The US and its allies are considering launching missile strikes against Syria after a suspected chemical attack, an action which Russian Federation - whose forces are there supporting the government- has said would risk starting a war.
Guterres said that the Security Council's main responsibility is to keep worldwide peace and security.
Britain's United Nations ambassador, Karen Pierce, noted that Prime Minister Theresa May's cabinet "has agreed on the need to take action to alleviate humanitarian distress and to deter the further use of chemical weapons by the Assad regime".
Syrian President Bashar al-Assad denies using chemical weapons against civilians.
Yildirim on Friday again condemned the "heinous" the attack in Douma and said the perpetrators should "pay a price".