A few hours after the drone left, Russian-made fighter jets bombed the hospital in what US officials believe was an attempt to hide the use of chemical weapons.
She told an emergency meeting of the U.N. Security Council called by Russian Federation that should the US and its allies decide to act in Syria it will be to defend "a bedrock global norm that benefits all nations" - the prohibition on the use of chemical weapons.
"Insulting the President of Russian Federation is unacceptable and inadmissible", he added.
"Did a chemical weapons attack happen?"
The Kremlin said Mr Putin warned against rushing to blame the Syrian government before conducting a "thorough and objective probe".
Britain's U.N. ambassador is vehemently denying a Russian military claim that the United Kingdom staged an alleged chemical attack in Syria last weekend, calling it "bizarre" and "a blatant lie". There is no evidence for now that the Syrian government has used chemical weapons, Azimov said.
Saturday's strikes were limited in scope despite bellicose rhetoric from both sides, while a direct clash between the West and Russian Federation in Syria could quickly flip the seven-year-old conflict in a new and unsafe direction.
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.
"We are open for those contacts, they help to understand each other better", Lavrov said. "No final decision has been made", White House Press Secretary Sarah Sanders said, adding that Trump would confer with French President Emmanuel Macron and British Prime Minister Theresa May. And it would establish a body to determine responsibility for chemical attacks, call for a cease-fire in Syria, unimpeded access for all humanitarian aid, and an urgent resumption of negotiations on a political settlement. Moscow alleged soon after the suspected April 7 attack that the images of the victims in Douma were fakes. Mattis said no additional attacks were planned, though Trump earlier suggested the strikes could last longer.
Guterres also said a failure to hold someone accountable for the attack could encourage more.
"Why would the winning side use (chemical) weapons", he said in a video address at a Hezbollah campaign event for Lebanon's parliamentary elections in May. The government, however, said evacuations from Douma were ongoing and no Syrian government forces had entered the town.
"If there is a USA missile attack, we - in line with both Putin and Russia's chief of staff's remarks - will shoot down USA rockets and even the sources that launched the missiles", Zasypkin told al Manar.
The Kremlin has said it severely condemns the "act of aggression" and has called an emergency session of the United Nations Security Council.