"The immediate priority is to avert the danger of war", he told reporters.
Nikki Haley, the US ambassador to the United Nations, on Friday accused Russian Federation of lies and covering up for Assad, which she said had used chemical weapons at least 50 times in the past seven years of warfare.
Britain's defence ministry said that while the effectiveness of the strike is still being analyzed, "initial indications are that the precision of the Storm Shadow weapons and meticulous target planning have resulted in a successful attack".
"We're not allowed to see our citizens, talk to doctors, we have no idea about the treatment Russian nationals receive", he said. And France has analyzed, yes, it has happened. "We hope there will be no point of no return", the envoy said.
A larger strike, possibly including stealth aircraft and strikes on multiple sites, could inflict lasting damage to military facilities and economic infrastructure that have been vital to President Bashar Assad's ability to regain his grip on Syria seven years into a grinding war.
"Russia must decide", Trump said, "if it will continue down this dark path, or if it will join with civilized nations as a force for stability and peace". "We need to know where that's going, what the objective of it is before we take that act".
"We have a very high confidence that Syria was responsible and, once again, Russia's failure to stop them and their continued (lack of action) on this front has been part of the problem", White House spokeswoman Sarah Sanders said.
Mattis said the president's National Security Council would be meeting later Thursday to "take forward the various options" for Trump.
At the United Nations meeting, Syrian Ambassador Bashar Jaafari warned that Syria would respond if the USA moved against his country.
The U.S., France and Britain have been in extensive consultations about launching a military strike as early as the end of this week, U.S. officials have said. "This is not a threat".
The decision to strike, after days of deliberations, marked Trump's second order to attack Syria.
Shikhar Dhawan led SRH to an easy victory
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Epic Games will soon disclose more about this particular issue and how they are progressing with the same. Fortnite will be coming out of maintenance later today with the 3.5 update.
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The claim comes after a week in which Russian diplomats and military officers denied the attack happened, blamed the rebels for attacking themselves and accused foreign intelligence operatives. "We have weighty justification to believe. that what took place was a provocation of certain countries' intelligence services".
Allied missiles struck at the heart of Syrian chemical weapons arsenal in a show of force and resolve aimed at punishing the Assad government for a suspected poison gas attack against civilians and deterring the possible future use of such banned weapons.
He did not say what the evidence was.
"The situation in Syria is horrific, the use of chemical weapons is something the world has to prevent", Britain's Brexit minister David Davis said on Thursday morning.
On Friday, the President told Americans the recent chemical attack in rebel-held Douma was "not the actions of a man, they are crimes of a monster instead".
Meanwhile, Western allies of the USA came out in support of the strikes. This scenario, he said, "cannot be tolerated. especially in light of the deployment in Syria of the Russian contingent".
"I am in awe you can say what you say with a straight face", Haley said, directing her comments to Nebenzia.
"Russia was supposed to guarantee Assad would not use chemical weapons, and Russian Federation did the opposite". He said at least one chemical was used - chlorine, which also has legitimate industrial uses and had not previously triggered a US military response.
Syria's military has repositioned some air assets to avoid fallout from possible missile strikes, United States officials told Reuters on Wednesday.
UN Secretary-General Antonio Guterres opened the Security Council meeting without referring to either Russian Federation or the USA, but stressed his deep concern that the growing tensions could spiral into broad conflict.