Addressing Parliament, she added the United Kingdom had "explored every diplomatic channel" but said military intervention had proven necessary and the United Kingdom was acting in the national interest, not just following US President Trump.
In remarks that could indicate an attempt to bog down the OPCW team, Russia's deputy foreign minister, Sergei Ryabkov, said the inspectors will not be allowed to access the site until they produce an appropriate United Nations permit.
Moscow claims that Soviet-era weapons shot down about 70 percent (71) of the 103 missiles fired by the United States and its allies, prompting Assad to declare that the strikes demonstrate Russian weapons are superior to the United States ones.
President Donald Trump and his British and French allies on Saturday hailed the joint strikes in Syria in response to its alleged use of chemical weapons, warning Damascus that any repetition would be met with renewed firepower.
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The missile strikes have drawn the ire of chief Syrian government allies, Russian Federation and Iran. Hill says in 2013, the Russians promised to oversee the withdrawal of chemical weapons from Syria.
She said Russian Federation had blocked six attempts by the UN Security Council to make it easier to investigate the use of chemical weapons.
US 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 mission is in retaliation for last Saturday's suspected chemical attack that killed dozens of Syrian civilians, including children.
OPCW Director-General Ahmet Uzumcu said Syrian and Russian officials cited "pending security issues" in keeping its inspectors from reaching Douma. "And they will go directly to any sort of companies that were dealing with equipment related to Assad and chemical weapons used".
The White House statement came hours after French President Emmanuel Macron said he had convinced Trump to stay engaged in Syria "for the long term". No more attacks are planned, said Mr Mattis, unless Mr Assad uses chemical weapons again.
Mr Assad was described by the Russians as being in a good mood, a day after the airstrikes destroyed three chemical weapons facilities.
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The program will pick one victor from each school to receive $25,000 for the upcoming school year. Applicants will be selected from various majors and are required to maintain a 3.5 GPA or above.
The strikes "will significantly impact the Syrian regime's ability to develop, deploy and use chemical weapons in the future", said Lieutenant General Kenneth McKenzie, director of the United States military's Joint Staff, though he noted a "residual" element remained.
The British government is not legally bound to seek Parliament's approval for military strikes, although it is customary to do so, and many lawmakers expressed anger that they were not consulted.
"I'm afraid that is the unhappy corollary of this that if we say we're limiting our action to chemical weapons. then of course it follows that the rest of the Syrian war must proceed as it will", Johnson told BBC television.
Appearing on Fox News Sunday, U.S. Ambassador to the United Nations Nikki Haley said in a military context the president's declaration of "mission accomplished" refers only to the "task now in front of you" and the United States will continue to monitor Assad's use of chemical weapons and are prepared to respond with further action in the form of additional military action.
Her office said she planned to tell them the strikes were "in Britain's national interest" and were carried out to stop further suffering from chemical weapons attacks. The Pentagon says no missiles were engaged. She accused Syria, aided by Russian Federation, of trying to block an investigation into the gas attack by the worldwide chemical weapons watchdog.
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After the stewards cleared the paper strands, they threw another round they held back in reserve to delay the second half even further.
Igor Kirillov, a Russian chemical weapons protection expert in The Hague, said the team is set to visit the site on Wednesday.