In a UN Security Council session Saturday, American UN Ambassador Nikki Haley warned that the U.S. was "locked and loaded" to take aim at Syria again if Assad uses chemical weapons again.
In the coastal city of Latakia, a northern province, hundreds of civilians congregated in Sheikh Dahir Square to express that the aggression against Syria failed because of the steadiness of the Syrian army.
On the "Fox News Sunday" program, Haley again slammed Russian Federation, accusing it of enabling the Syrian government to use chemical weapons without worrying about blowback at the United Nations.
U.S. Ambassador to the United Nations Nikki Haley said on Sunday that the United States would not pull its troops out of Syria until its goals were accomplished.
Assad didn't comment on calls by the US State Department to declare alleged Syrian stockpiles of chemical weapons during the meeting. "Use often!" he said.
"There is no proposal on the table for further attacks because so far, thank heavens, the Assad regime has not been so foolish as to launch another chemical weapons attack", he told BBC1's Andrew Marr Show.
Russian Federation also decried the USA -led operation as a failure, saying the majority of the rockets fired at Syria were intercepted by the Syrian government's air defense systems.
But British Prime Minister Theresa May said there was little doubt the Syrian government used a barrel bomb - large containers packed with fuel, explosives and scraps of metal - to deliver the chemicals at Douma.
Russian agencies quoted the lawmakers as saying that Assad was in a "good mood", had praised the Soviet-era air defence systems Syria used to repel the Western attacks and had accepted an invitation to visit Russia at an unspecified time. Haley noted that Russian Federation has vetoed six resolutions in the U.N. Security Council regarding chemical weapons.
"Assad knew that Russian Federation had its back, Assad knew that Russian Federation would cover for them at the United Nations, and Assad got reckless, and he used it in a way that was far more aggressive", she said.
"This was very strong attack on the chemical weapons program".
The aim, she said, is "to see American troops come home, but we are not going to leave until we know we have accomplished those things".
Sarin had previously appeared to be the threshold for intervention. The military said there were three targets: the Barzah chemical weapons research and development site in the Damascus area, a chemical weapons storage facility near Homs and a chemical weapons "bunker" a few miles from the second target. Chlorine, in contrast, has been used more widely in Syria's conflict without past United States reprisals and is far easier to find and weaponise, experts say.