Haley added that the USA wants to ensure that chemical weapons are not used in a way that is of risk to U.S. interests, Islamic State (IS, formerly ISIS) is defeated, and Iran's actions are monitored."Be very clear, if we leave, when we leave, it will be because we know that everything is moving forward", Haley added.
Mr Nebenzia accused the US, UK and France of "hooliganism" and of "demonstrating a blatant disregard for global law".
United Nations Ambassador Nikki Haley was especially blunt in her assessment of the Syrian regime during meetings with Trump, the person said.
"When our president draws a red line, our president enforces the red line", Haley stressed.
Syrian allies, Iran and Russian Federation have condemned the action, with Russia's foreign minister Sergei Lavrov insisting the chemical attack was staged, and claiming the West can't prove otherwise. He said Russian Federation "should join our efforts to promote a political process in Syria that would allow a way out of the crisis".
Syrian police units wave the national flag as they enter the town of Douma, Eastern Ghouta, on April 14, 2018 as the last of the rebel fighters who held the town for more than four years departed under an evacuation deal with the government.
Several other passengers were also wounded by the attack on Saturday on the convoy that left the town of Douma under a Russia-brokered evacuation deal, the Britain-based Syrian Observatory for Human Rights said. It was a message he repeated after the strikes to US President Donald Trump and the Turkish leader Recep Tayyip Erdogan.
The United States and its allies said Sunday there are no plans for further attacks against Syria, but warned additional chemical attacks could prompt military response.
Washington, Paris and London have all described the strikes as a success, but Johnson acknowledged he did not know whether Assad could still possess chemical weapons and activity in Syria would be monitored on a daily basis.
"This is not about regime change".
Russian Federation said on Saturday it would consider supplying S-300 surface to-air missile systems to Syria following the Western strikes, but this was not discussed at the meeting with Assad, agencies reported.
They quoted the legislators as saying Assad was in a "good mood" and accepted an invitation to visit the Siberian region of Khanty-Mansi. It included a visit to the main hospital to which the victims of the alleged chemical attack where taken. Macron said in an interview broadcast by BFM TV, RMC radio and Mediapart online news that he had convinced Trump to focus on the chemical weapons sites.
France, the United States and Britain circulated a draft resolution to the U.N. Security Council late on Saturday that aims to establish an independent inquiry into who is responsible for chemical weapons attacks in Syria.
On Saturday a top Pentagon chief boasted the missile strikes struck at the "very heart of the enterprise", impacting the research, development and storage of chemical weapons.
"We put a heavy blow into their chemical weapons program, setting them back years", Haley told Wallace.