Top military officials, including Defense Secretary James Mattis, warned Trump during an afternoon meeting Thursday that he risks escalating United States involvement in Syria if he goes forward with the type of aggressive bombing campaign he has pushed over the past week, according to USA and Western officials briefed on the conversation.
She told an emergency meeting of the U.N. Security Council called by Russian Federation that should the USA and its allies decide to act in Syria it will be to defend "a bedrock worldwide norm that benefits all nations" - the prohibition on the use of chemical weapons.
"Insulting the President of Russian Federation is unacceptable and inadmissible".
He said the airstrikes were launched against several sites that helped provide al-Assad with the ability to create chemical weapons.
"This is grotesque", Pierce said of the Russian statement as she left an emergency meeting of the UN Security Council called by Russia on USA threatened military action in response to the alleged attack.
For now, Putin has limited his response to calling an urgent meeting of the U.N. Security Council.
In particular, the Russian minister discussed the allegations of chemical weapons usage by the Syrian government forces in the East Ghouta town of Douma.
Fyodor Lukyanov, head of the Council for Foreign and Defense Policies, an association of top Russian foreign policy and security experts, said on state TV that Moscow's warning to strike back "clearly hasn't come unnoticed by the Pentagon, and the strike was quite careful".
The U.N. Security Council was to meet again Friday, at Russia's request, to try to defuse the standoff, as U.S. President Donald Trump appeared to back away from imminent action, days after warning Russian Federation to "get ready" for missile strikes.
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A team of inspectors from the OPCW arrived in Syria on Thursday and yesterday and had been expected to start their investigation into the alleged Douma attack today.
As fears of a Russia-West military confrontation mounted, French President Emmanuel Macron expressed his "deep concerns" over the situation in Syria in a phone call with Russian President Vladimir Putin.
Erdogan also told reporters on Friday that tensions between the two countries over a suspected chemical attack in the Damascus suburb of Douma now seem to have eased.
However, she said that when it will take place has not yet been finalised.
Trump had also said last week that Putin bore responsibility for the "atrocity" in Douma.
What has Trump said about the attack?
President Bashar al-Assad's government - which receives military backing from Russian Federation - denies any involvement and says reports of a chemical attack are "fabricated".
Britain's UN Ambassador Karen Pierce blamed Russian Federation for repeatedly vetoing resolutions on the use of chemical weapons in Syria and said the United Kingdom took military action "to save lives, " on the legal basis of "humanitarian intervention".
On Friday, Russian lawmakers drafted a bill under which the country may ban exports of titanium components to USA aircraft manufacturer Boeing.