President Donald Trump tweeted Wednesday that missiles "will be coming".
But President Bashar al-Assad's government - which receives military backing from Russian Federation - denies being behind any chemical attack.
"We support serious approaches".
But she says, "No final decision has been made".
The recent military victories Syrian army gained in Douma and elsewhere in Eastern Ghouta were the main reasons behind Trump's threat to attack Syria, al-Atrash said.
Meanwhile, the Daily Telegraph has claimed that British submarines have been ordered to move within missile range of Syria amid reports about an imminent USA strike on President Bashar Assad's forces.
But she said the USA holds Russian Federation and Syria responsible for the incident.
"The immediate priority is to avert the danger of war", said Ambassador Vassily Nebenzia following closed-door Security Council talks.
Officials also said that the US has compiled intelligence from the USA and other countries, including images, that indicate the Syrian government was behind the weekend attack.
He said the USA military was ready to provide the President with military options, if appropriate and at the President's request.
But a special hotline for the U.S. and Russian militaries to communicate about operations in Syria is active and being used by both sides, Moscow said Thursday.
The Kremlin was speaking as British ministers planned to gather to discuss whether to join the United States and France in a possible military attack on Syria that threatens to bring Western and Russian forces into direct confrontation.
That may prove too little, too late. "We have the proof that chemical weapons - at least chlorine gas - were used by Assad's regime", Macron told France's TF1 television.
British Prime Minister Theresa May called an emergency cabinet meeting for Thursday, with reports indicating that she has already ordered submarines to move within missile range of Syria. In Syria, this instinct points him away from a military-centric answer to Assad, writes Bonnie Kristian.
Britain has been launching air strikes in Syria from its military base in Cyprus, but only against targets linked to the Islamic State militant group.
National security experts anxious about whether strikes would actually serve to deter Assad.
But the pinpoint strike did not deter Assad and U.S. officials, speaking on condition of anonymity, have since investigated as many as 10 suspected chemical attacks. Syria's official SANA news agency reported.
A Syrian lawmaker said on Thursday he did not believe the USA would attack Syria over the chemical attack accusations against Syrian troops. The fact-finding mission of the OPCW is to start their work in Douma on Saturday.