It did not mention the overall number of missiles intercepted by Syrian forces. In a warning to the West against further strikes on Syria, the Russian Defense Ministry said it is now considering arming Assad with Russian S-300 long-range surface-to-air missile systems for the first time.
British Prime Minister Theresa May and French President Emmanuel Macron said the United Kingdom and France had joined in the attack.
US Defence Secretary Jim Mattis said the strikes were a "one-time shot" and that no additional airstrikes were now planned.
A U.S. official told Reuters news agency the attacks were aimed at multiple targets and involved Tomahawk cruise missiles. A second witness said the Barzah district of Damascus had been hit in the strikes.
Assad also declined to comment on calls by the US State Department to declare alleged Syrian stockpiles of chemical weapons, Zheleznyak said.
The OPCW had said that its experts would be visiting Douma on Saturday.
Hours later, the Russian Embassy in Damascus said no Russians were known to have been hurt in the overnight airstrike. In the past 12 days alone, 12,000 people left the city, Syria's state news agency said. "Could be very soon or not so soon at all!"
Karen Pierce also labelled the Russian allegation as "grotesque", saying she wanted "to state categorically ... that Britain has no involvement and would never have any involvement in the use of a chemical weapon".
At a Pentagon briefing, Chairman of the Joint Chiefs of Staff General Joseph Dunford said the targets included a Syrian research facility and a chemical weapons storage facility.
He added that "those responsible must be held accountable".
The US and France said they had proof it took place and, alongside the United Kingdom, were considering military retaliation.
It said Syria had not answered questions on matters including possible remaining stocks of yperite (mustard gas) and DF (a sarin precursor), undeclared chemical weapons of small caliber and signs VX and sarin on production and loading sites.
The statements, reviewed by the Associated Press, claim that people with video cameras came into the hospital and caused a "panic" by yelling about chemical weapons, but that there were no actual victims suffering from chemical injuries. He urged United Nations member states to show restraint and avoid any acts that could escalate the situation.
Syrian TV called the attacks a "blatant violation of worldwide law and shows contempt for global legitimacy". Lavrov continued to state that it was led by only one country, but he refused to give the name.
The Kremlin said Mr Putin yesterday warned his French counterpart during a telephone call against any "dangerous actions" in Syria. It was not clear when the visit would take place.
Iran is a key ally of Syrian President Bashar Assad and has sent troops to bolster his forces. The war and politics of Syria are broadly going its way.
Russian Federation says Syria shot down a significant number of the missiles launched in a Western airstrike, using Soviet-designed air-defense systems.
Defense Secretary Jim Mattis, however, indicated that evidence of what happened was still being studied. It did not say how numerous missiles were intercepted by Syrian forces. Air defence units fired surface-to-air missiles from different directions toward incoming missiles.
Syria had omitted to declare numerous activities of its Scientific Studies and Research Centre (SSRC), the report said.
"We are continuing to assess intelligence and are engaged in conversations with our partners and allies", it added.
U.S. President Donald Trump announced Friday night that the three allies had launched military strikes to punish Syrian Assad for alleged chemical weapons use and to prevent him from doing it again.
Hundreds of Syrians gathered at landmark squares in the Syrian capital Saturday, honking their vehicle horns, flashing victory signs and waving Syrian flags in scenes of defiance that followed unprecedented joint airstrikes by the United States, France and Britain.
The U.S. president, who has tried to build good relations with Russian President Vladimir Putin, had sharply critical words for Russia and Iran, which have backed Assad's government.
The Syrian government denies responsibility.
In Damascus, the president's seat of power, hundreds of residents gathered in Omayyad Square, many waving Syrian, Russian and Iranian flags. Some clapped their hands and danced, other drove in convoys, honking their horns in defiance.
State TV broadcast live from the square where a large crowd of civilians mixed with men in uniforms, including an actor, lawmakers and other figures.
The world must provide a "robust, united and steadfast response", he said.