But she added: "Putin is not impervious to mistakes". For the west, it is the normalisation of the use of weapons of mass destruction.
"We are still assessing the intelligence - ourselves and our allies", he told reporters alongside his Dutch counterpart Wednesday.
Assad denies he has used chemical weapons, and the Trump administration has yet to present hard evidence of what it says precipitated the allied missiles attack: a chlorine gas attack on civilians in Douma on April 7.
"Until we have a more long-term strategy, until we have some idea where we're going in Syria and the Middle East, it seems unwise, to me, to start launching missiles", said Smith, D-Wash. The White House said he would consult further with allies.
Trump was responding to a Russian warning on Tuesday that any U.S. missiles fired at Syria over the assault on a rebel enclave would be shot down and the launch sites targeted.
US Navy sailors load a Tomahawk cruise missile into a submarine.
Eurocontrol, Europe's main air traffic control agency, said aircraft flying in the eastern Mediterranean should exercise caution due to possible military action against Syria.
Experts told Business Insider, however, that such a confrontation was unlikely.
"Russia vows to shoot down any and all missiles fired at Syria". He distinguished between official, enlisted soldiers - known as regulars - and military contractors, whom the US has engaged in the past. "We stand for serious approaches", he said. Syria denies the accusation.
U.S. officials tell The Associated Press that the allies have weighed launching a military strike as early as the end of this week.
A child being treated for suspected chemical gas poisoning in Douma, Syria, on Sunday.
Trump also has blamed supporters of Assad in Iran and Russia for the attack. But Syria and Russia have denied that charge.
Kupchan said the Kremlin may once have held influence over Assad, when there was a chance he could lose the ongoing civil war.
After May met with her Cabinet, a spokesperson issued a statement saying it is highly likely that Syria's President Bashar Assad was responsible for Saturday's attack that killed dozens outside Damascus.
However, the World Health Organisation said on Wednesday it had received reports that hundreds of people had visited Syrian health facilities with "signs and symptoms consistent with exposure to toxic chemicals" at the weekend.
Assad said Thursday that Western threats to strike Syria are based on "lies" and seek to undermine his forces' advances near Damascus.
"The Russians want a peace deal". "That's why they don't like him so much".
A global chemical warfare watchdog group, the Organization for the Prohibition of Chemical Weapons, said its fact-finding mission would go as planned in Douma. Deconfliction lines between the US and Russia help.
Russian lawmakers have warned the United States that Moscow would view an airstrike on Syria as a war crime and that it could trigger a direct U.S-Russian military clash.
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