Nikki Haley, the USA ambassador to the United Nations, warned Syrian President Bashar al-Assad on Sunday that the US would launch new missile strikes against his regime if he carries out another chemical weapons attack.
Although Israel has at times urged stronger US involvement against Assad and his Iranian and Lebanese Hezbollah reinforcements in Syria, it voiced backing for Saturday's air strikes by Western powers.
"We of course know our work in Syria is not done", Haley said. "We'll watch his actions".
Both Damascus and its ally Russian Federation have denied using any such weapons.
The United Kingdom and its partners in the UN Security Council - the United States and France - hope that China and possibly Russian Federation will support their new draft resolution on mechanisms for investigating chemical attacks in Syria, UK Ambassador to the United Nations Karen Pierce told Fox News on Sunday.
A Pentagon spokesperson told Reuters: "There is no USA military activity in that area at this time".
Ryabkov also said Russian Federation would study a United Nations resolution on Syria proposed by the US, France and Britain, but added that it would be hard to reach a compromise on the issue, TASS reported.
Haley rejected the premise posed by Fox News anchor Chris Wallace that the US has condoned Assad's use of conventional weapons to kill rebels attacking his forces, just not chemical agents.
"No Syrian weapon had any effect on what we did", said McKenzie. "We can't control what a country does to its people".
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With Russian involvement in Syria and Moscow condemning Saturday's allied missile strike, Haley acknowledged that U.S.
Mr Putin's comments were published shortly after Russian Deputy Foreign Minister Sergei Ryabkov struck a more conciliatory note by saying Moscow would make every effort to improve political relations with the West.
"Everything that has strained the relationship is on Russia's side", she said, adding that the USA hopes for improved relations with Moscow, but that "we're not going to put up with bad behavior to get it".
U.S. Ambassador to the United Nations Nikki Haley told the CBS TV program "Face the Nation" that the United States would announce new economic sanctions Monday aimed at companies "that were dealing with equipment" related to Syrian President Bashar Assad's alleged chemical weapons use.
USA military officials said an initial assessment showed every one of the missiles struck its target on Saturday, reducing the facilities to rubble while avoiding any civilian casualties.
The incident underscored fears of a further escalation in the Syrian conflict after a U.S., British and French attack on Syrian targets on Saturday and an air strike on an air base the previous week that Damascus blamed on Israel.
Johnson added there was no proposal in place for further attacks, but if Assad's regime were to repeat chemical attacks "clearly, with allies, we would study what the options were".
According to Vladimir Putin, the United States used a staged chemical attack against civilians to carry out a strike. But late Saturday, senior administration officials called the evidence "incontrovertible".
After the air strikes U.S. Lt. Gen. Kenneth McKenzie, director of the joint chiefs of staff, said he hadn't seen any indication that Russian air defense systems were used, calling Syria's response "indiscriminate" and mostly futile.