Standing firm, the Trump administration on Friday signaled new sanctions would soon follow the missile attack, and the Pentagon was even probing whether Russian Federation itself was involved in the chemical weapons assault that compelled President Donald Trump to action.
Tuesday's chemical attack killed at least 100 people and injured more than 500.
The airstrikes on the opposition-held northern town of Khan Sheikhoun, where 87 people were killed in the chemical attack earlier this week, killed a woman and wounded her son, according to the Britain-based Syrian Observatory for Human Rights and the Local Coordination Committees, an activist collective.
The presence of Russian advisers at the airfield used to launch the attack raised questions about how they could not have known about Syria's chemical weapons.
Sen. Dianne Feinstein of California said the strikes were "a limited but necessary response" and called on Trump to "develop a comprehensive strategy to end Syria's civil war".
He said he would call on Russian Federation "to fulfill the obligation it made to the global community when it agreed to be the guarantor of the elimination of the chemical weapons".
Haley said the US was prepared to take further action in Syria but hoped it wouldn't be necessary. Syria's government has denied responsibility.
US Secretary of State Rex Tillerson has expressed Washington's "disappointed" at Russia's hostile reaction to airstrikes on a Syrian airbase on Friday.
The U.S. ambassador to the U.N., Nikki Haley, said the world is waiting for the Russian government "to act responsibly in Syria" and "to reconsider its misplaced alliance with Bashar Assad".
British Foreign Secretary Boris Johnson canceled a planned trip to Russian Federation because of fast-moving events in Syria.
North Korean Missile Test Fails, US And South Korea Say
North Korea has conducted 50 known missile tests like Saturday's since Kim Jong Un took power after his father's death in 2011. Senior North Korean officials on Monday reiterated recent warnings that the situation was "nearing the brink of war".
According to US Department of Defense, a total of 59 Tomahawk cruise missiles were launched during the attack.
A USA military official told CNN the Pentagon was examining specifically whether a Russian warplane had bombed a hospital in Khan Sheikhoun five hours after the initial chemical attack, with the aim of destroying evidence.
In response, the U.S. fired 59 Tomahawk missiles at a Syrian military air base American officials believe was used to carry out the attack. For that to happen, he said, "this oppressive Assad needs to go".
Trump said the operation was in response to a chemical attack in Idlib province.
Russian Federation flatly denies the allegations.
Russia's Defense Ministry said Saturday that Washington has not provided any evidence that chemical weapons came from the Shayrat base.
"I discussed these plans in detail with Secretary Tillerson", Johnson said, adding that the USA foreign minister would still visit Moscow as planned following the G7 meeting to "deliver that clear and coordinated message to the Russians".
Tillerson is expected in Moscow this week for talks with Russian officials.
Russian President Vladimir Putin denounced the U.S. strike as an "act of aggression" and said it violated worldwide law.
He said on Twitter that the "conditions for negotiations in Moscow were even worse than (former Secretary of State John) Kerry's times". "I hope this teaches President Assad not to use chemical weapons again".
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