"We are considering additional sanctions on Russian Federation and a decision will be made in the near future", White House spokeswoman Sarah Sanders said as quoted by the statement.
Sergei Lavrov said: "I can guarantee that Russian Federation has not tampered with the site".
"We convinced him to limit the strikes to chemical weapons when at the same time there was a burst of tweets that did not escape you", Macron said.
But the British delegation to the OPCW, citing the agency's director general, said Russian Federation and the Syrian regime had not yet allowed inspectors access to the sites in Douma.
Inspectors from the Organisation for the Prohibition of Chemical Weapons (OPCW) went to Syria last week to inspect the Douma site but have yet to gain access to the town, which is now under government control after the rebels withdrew.
In the aftermath, the remnants of a rebel army evacuated, handing Assad one of the biggest victories in a war that has killed about half a million people and laid waste to whole cities. Syrian Deputy Foreign Minister Faisal Mikdad met with members of the watchdog group in their Damascus hotel Sunday.
Inspectors arrived in Syria on Saturday to determine if chemical weapons were used in the deadly attack that has left up to 70 people dead.
The US authorities are considering additional sanctions on Russian Federation and the relevant decision will be taken soon, according to the White House's statement TASS received on Monday.
A day after the U.S., Britain and France bombarded sites they said were linked to a chemical weapons program, Syrian President Bashar Assad appeared briefly on state TV, seemingly unfazed by the military action - and even reportedly in high spirits.
Russian and Syrian officials "have informed the. team that there were still pending security issues to be worked out before any deployment could take place", he said.
The US said no special United Nations permission was required.
Russian Foreign Minister Sergei Lavrov denied that Moscow had interfered with any evidence: "I can guarantee that Russia has not tampered with the site", he told the BBC in an interview.
In an official statement the ministry said that the use of chemical weapons in Syria, it said, "crossed all possible red lines" adding, "Those responsible for use of chemical weapons against civil population, including children, must be held accountable".
He said: "I'm afraid the Syrian war will go on in its disgusting, miserable way".
"The European Union will continue to consider further restrictive measures against Syria as long as the repression continues", they said in a statement after their talks. But it is unclear how much capacity Syria retains to produce chemical weapons and whether the strikes chipped away at the government's political will to deploy them.
The United States, Britain and France fired more than 100 missiles at three alleged chemical weapons facilities on Friday, angering the Syrian regime's military backer Moscow, which threatened to retaliate. The French Constitution bars presidents from going to parliament and President Emmanuel Macron will therefore not be questioned by law-makers.