In an indication that the West, too, would prefer to lower tensions, the U.S. and Britain both reiterated that their military action on Saturday was not aimed at Assad, Putin's ally, only at his use of chemical weapons.
"The Syrian raid was so perfectly carried out, with such precision, that the only way the Fake News Media could demean was by my use of the term 'Mission Accomplished.' I knew they would seize on this but felt it is such a great Military term, it should be brought back".
Both Damascus and its ally Russian Federation have denied using any such weapons. "They will go directly to any sort of companies that were dealing with equipment related to Assad and chemical weapons use".
"We'll see how smart he is", Haley said.
Sheikh Hassan Nasrallah said the USA military had kept its strikes limited because it knew a wider attack would spark retaliation from Damascus and its allies and inflame the region.
"We are determined to completely crush ISIS and create the conditions that will prevent its return." she said, referring to the Islamic State extremist group.
"In the U.S. administration there are specific people who it is possible to talk with", said Mr Ermakov, head of the ministry's department for non-proliferation and arms control.
Theresa May tells British Parliament that Syria strikes were 'legal and moral'
He said Britain should introduce a War Powers Act to ban military action without Parliament's approval. "If not, she's the one that will take the blame".
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.
On Friday night, the United States, France and the United Kingdom launched strikes on a number of targets in Syria in response to the alleged chemical incident in the Damascus' suburb of Duma. Responding to the airstrikes, Putin on Saturday condemned what he called "an attack on Syria".
The U.S. and its allies accused Assad's forces of using chemical weapons, a claim Syria and Russian Federation have rejected. According to Damascus, which has repeatedly said that it eliminated its chemical weapons stockpiles, the attack damaged Syrian infrastructure, and left three civilians injured. The legality of the air strikes under worldwide law, however, remains questionable.
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".
Syrian media, Russian and Syrian officials have sought to downplay the impact of the joint airstrikes, saying the Syrian air defenses have intercepted most of the missiles.