"Due to the rapid escalation of the situation, Russian Federation calls on the technical secretariat to urgently send the mission's experts to establish the facts of the alleged chemical weapons usage in Syria in order to clarify all the details of the incident", Russia's mission to the Organization for the Prohibition of Chemical Weapons (OPCW) said on Tuesday.
The Security Council held an emergency meeting to discuss the chemical attack and the council president said experts were working on a resolution on the continuing use of chemical weapons in Syria, but sharp differences remain between Russian Federation and the US and its allies.
U.S. President Donald Trump was expected to unveil on Tuesday what he has promised would be a "forceful" response to the latest episode.
Haley also slammed the Security Council's failure to counter Syria normalizing the use of chemical weapons, saying: "The great evil of chemical weapons use that once unified the world in opposition is on the verge of becoming the new normal".
A resolution needs nine votes in favor and no vetoes by Russia, China, France, Britain or the United States to pass.
US Ambassador Nikki Haley urged the council to take action, but warned that the United States was ready to respond.
"History will record that, on this day, Russian Federation chose protecting a monster over the lives of the Syrian people", Haley said, referring to Assad.
The UN on Monday admitted its "feeble condemnations and paralyzed Security Council" in the wake of a deadly chemical attack in Douma, Syria, that reportedly killed dozens of civilians including women and children.
Doctors and witnesses have said victims showed symptoms of poisoning, possibly by a nerve agent, and reported the smell of chlorine gas.
"If it's Russian Federation, if it's Syria, if it's Iran, if it's all of them together, we'll figure it out and we'll know the answers quite soon", Trump said.
A suspected chemical attack by Syria's regime sparked worldwide outrage.
She said discussions were ongoing over a possible military response by Britain and its allies that would prevent "repeats". Both stressed that the culprit still needed to be confirmed.
Once again, the now seven-year-old conflict serves as an arena for powers to clash. "It was disgusting", Trump said at the start of a Cabinet meeting where possible military action was discussed. Reacting to the reports, the United States and the European Union said Syrian government of President Bashar Assad were behind the attack.
Russian Foreign Minister Sergei Lavrov in early April said he welcomes Trump's pledge of an early withdrawal from Syria, despite what he called "worrisome" signs that USA troops were becoming "deeply entrenched" in areas east of the Euphrates River in fighting the Islamic State (IS) group.
Will the USA respond if chlorine was used in the attack, and not a nerve agent? The Syrian government denies responsibility.
The United States should make its policies and commitments well known to friends and foes, but when it comes to combat, Mattis said, it should rely on the element of surprise.
The U.S. military appeared to be in position to carry out any attack order.
Mrs May sidestepped a question on whether Parliament would be recalled from recess to debate any military intervention. Most members of Congress - Democrats as well as his fellow Republicans - praised Trump after the strike a year ago.
The U.S. and other world powers suspect Syrian government forces of being behind the attack, which reportedly killed almost 50 people, including children.
"Chemical weapons have once again been used on Syrian men, women and children", Haley said, pointing out that it was only one year ago that she had held up pictures of dead Syrian children following a chemical attack that killed almost 100 people.