Trump's tweet - which he appeared to row back on on Thursday - appears to have given Syrian forces ample warning to move key assets, suggesting that any strike now would be largely symbolic and have little meaningful impact on the conduct of the war in Syria. "We'll be coming out of Syria, like, very soon", he said.
Germany is part of the USA -led coalition against the Islamic State in the region, but will not participate in any strikes on the Assad regime, German Chancellor Angela Merkel said in a video statement on Thursday.
"We're talking about humanity and it can't be allowed to happen", Trump said at a Cabinet meeting".
German Chancellor Angela Merkel said she supports sending a message that the use of chemical weapons is unacceptable but her country will not take part in any military action.
Russian Federation announced on Thursday that the Syrian government is in full control of a town on the outskirts of Damascus that was held by rebels and was the site of a suspected chemical attack over the weekend. "We have to make some further decisions".
May recalled the ministers from their Easter holiday for a special cabinet meeting in Downing Street later on Thursday to discuss Britain's response to what she has cast as a barbaric attack that can not go unchallenged. Since that time, much of the rebel enclave has been under siege.
The U.S. and its allies threatened military action after an alleged gas attack by government forces over the weekend that Syrian opposition activists and medics say killed more than 40 people.
In 2013, Russian Federation headed off a threatened attack by the USA and France by engineering the transport of chemical weapons out of Syria.
A network of local flight monitors said they had tracked several helicopters heading southwest from a government air base on Saturday evening.
President Donald Trump has emerged from a meeting with his national security team without a "final decision" on how to respond to a suspected chemical weapons attack in Syria.
"I don't think we're at the Cuban missile crisis level, but we're getting pretty damn close", Russian Federation expert Boris Zilberman of the Foundation for Defense of Democracies told AFP.More news: Hungary's PM to make 'significant changes' in government
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His latest tweet, on Thursday evening, said: "Never said when an attack on Syria would take place".
"They are the guarantors of law and order in the town", RIA news agency quoted Russia's defence ministry as saying.
Velayati congratulated Assad and the people on Syria on defeating terrorism in Eastern Ghouta, the media outlet reported.
There were signs, though, of a global effort to head off a unsafe conflict pitting Russian Federation against the West.
Macron kept up the drumbeat for likely war with his claim of evidence that chemical weapons were used in the attack, although he did not elaborate.
Tokyo issued a similar response in April past year when the United States conducted a missile strike on a Syrian air base that was the alleged source of a chemical attack that killed dozens of civilians.
He did not say whether France was planning military action.
"Russia vows to shoot down any and all missiles fired at Syria", Trump tweeted Wednesday. Locating them alongside Russian military hardware might make Washington reluctant to hit them. Earlier, Syria's ambassador to the United Nations, Bashar Jaafari, told reporters in NY that those investigators were to arrive Thursday and Friday.
Labour's Jeremy Corbyn, leader of the opposition, says that a vote is necessary and bombing could lead to a hot war between the USA and Russian Federation, which has promised to answer any strikes. A U.S. Navy guided missile destroyer, the Donald Cook, departed Cyprus on Monday in the Mediterranean Sea.
The Syrian conflict has widened the rifts between Moscow, Washington and European powers and inflamed the bitter rivalries that run across the Middle East.
Asked about the risks of US military retaliation, Mattis cited two concerns, starting with avoiding civilian casualties.
A YouGov poll published on Thursday showed just one in five British voters supported a missile strike on Syria.