As tensions mount between the U.S. and Russian Federation over a possible USA strike, the Kremlin said a crisis communications link with the United States meant to avoid an accidental clash over Syria was being used by both sides.
"We're looking very, very seriously, very closely at the whole situation", he told reporters. "We have to make some further decisions".
Since Saturday, when images of ashen toddlers struggling for breath emerged from Douma - the main city in the Eastern Ghouta enclave near Damascus that has been a crucible of revolt against Bashar Al-Assad's regime - there has been a sustained military buildup in the eastern Mediterranean.
The President, however, did not specifically refer to the attack's timing in his Wednesday tweet, though he warned Russian Federation to "get ready".
Russia's ambassador to Lebanon, Alexander Zasypkinhad, warned they would shoot down U.S. rockets and "even the sources that launched the missiles" - suggesting they could hit American aircraft or warships.
"The immediate priority is to avert the danger of war", said Ambassador Vassily Nebenzia following closed-door Security Council talks.
"China is anxious about the possibility of escalation of tension", Geng said.
A UN-led panel has determined that Assad's forces had used sarin in the town of Khan Sheikhun last yaer and chlorine in at least three attacks on villages in 2014 and 2015. US officials have been consulting with France, Britain and other allies on a possible joint military operation, but the timing remained in doubt Wednesday.
Opposition leaders have demanded a parliamentary vote before any new military action in Syria as Theresa May called an emergency Cabinet meeting to discuss the growing worldwide crisis.
"France will shoulder its responsibility to end an intolerable threat to our collective security", he added, before calling for an end to the "chemical weapons escalation in Syria".
At the United Nations meanwhile, diplomats were mulling a draft resolution put forward by Sweden and obtained by AFP, that would dispatch a "high-level disarmament mission" to rid the country of chemical weapons "once and for all". Is six years too late to intervene now?
"Never said when an attack on Syria would take place".
Speaking on TF1 television, Macron said that France would not tolerate "regimes that think everything is permitted".
Prime Minister Theresa May held an emergency cabinet meeting to discuss joining mooted strikes by the USA and allies, with ministers agreeing "on the need to take action", her Downing Street office said in a statement.
But across Western capitals opposition to military action also grew.
National security experts anxious about whether strikes would actually serve to deter Assad.
It came nearly exactly a year after a chemical attack in the northern Syrian town of Khan Sheikhoun killed dozens of people.
Outlining the reasons why he voted against, he said: "One was because he (Mr Cameron) hadn't provided the evidence and intelligence that we knew who it was, and secondly because there was not a proper plan which was thought through properly". British officials said up to 75 people were killed.
Are we trying to atone for the sins of our past, when large amounts of chemical weapons failed to materialize next door in Iraq? "People started shouting in the streets, 'Chemicals!"