"It will be met and it will be met forcefully", Trump said. "Get ready Russian Federation, because they will be coming, nice and new and 'smart!' You shouldn't be partners with a Gas Killing Animal who kills his people and enjoys it", tweeted Mr Trump.
But the Russian ambassador to the U.N., Vassily Nebenzia, said the chemical attack was staged and warned that any USA military response in Syria would have "grave repercussions". That was before Saturday's attack.
Russian Ambassador Vassily Nebenzia accused the United States of "planting this resolution" as a "pretext" to justify its future action on Syria.
Zakharova responded to Trump's comments in a subsequent Facebook post.
Trump cancelled a planned trip to Latin America where he was due on Friday to focus instead on responding to the Syria incident, the White House said.
With Iran as a longtime ally, and Russian Federation using its air and logistics power to aid him since the fall of 2015, Assad now has the upper hand, and there are few organized, non-extremist rebels with whom to negotiate.
"The Syrian regime continues to perpetrate crimes against humanity in using these outlawed weapons", the ministry said. Defense Secretary Jim Mattis also called off domestic travel plans. We tell everything. We're sending troops. "We're still working on this".
A cruise missile fired from a US Navy destroyer streaks towards Syria on April 7, 2017.
The Syrian government and Russian Federation said there was no evidence that a gas attack had taken place and the claim was bogus.
Nebenzia and Syrian Ambassador Bashar Ja'afari said that despite the council's failure to welcome the OPCW fact-finding mission, its investigators are heading to Syria with support from both Russian Federation and Syria. Trump, along with France, has promised a strong joint response in the coming days.
A Russian resolution that would have created a new expert body to determine responsibility for the chemical weapons attacks was also rejected.
The OPCW said it would "shortly" deploy a fact-finding team to Douma for an investigation, but United States officials said they were working from their own information and would not necessarily hold back, while Syrian forces were also mobilizing.
European air traffic controllers issued a "rapid alert" for airlines in the Eastern Mediterranean over the possibility of air strikes into Syria within the next 72 hours. Air France confirmed to NBC News that it had heeded the warning and adjusted its plans for its Beirut and Tel Aviv flights. All that happened is Putin's and Iran's positions at the table and on the ground in Syria, were strengthened and the USA position was weakened.
"GPS receivers in most drones can be fairly easily jammed", Dr. Todd Humphreys, the director of the Radionavigation Laboratory at the University of Texas at Austin said. "This year its about destroying actual Syrian capability".
USA officials have also spoken of military action against Syria, but the eyes were fixed on Tuesday evening on the session of the UN Security Council, where both major powers fought diplomatically.
"The aim is to soften the rigidity of Assad, to push him to accept, at least, starting of a peace process in Syria", he said.
Hundreds more people began to leave Douma on Tuesday and the pro-government Watan newspaper said about 40,000 militants and their families were due to leave in all, as the United Nations refugee agency voiced alarm at "spiralling new displacement".