The US military, assisted by forces from the United Kingdom and France, launched the strikes targeting chemical weapons operations this morning Australian time to punish President Bashar al-Assad for his alleged use of chemical weapons against his people.
Moscow also claimed Syrian rebels had now capitulated in Douma, less than 10 miles from the capital Damascus, to leave the city under the complete control of President Assad's forces and Russian military police.
In the meantime, British Prime Minister Theresa May said she had authorized British armed forces "to conduct co-ordinated and targeted strikes to degrade the Syrian regime's chemical weapons capability".
According to the sources, the specific response being considered in the event of USA military action against Syria is Japan's "support for the US resolve to fulfill its responsibility to prevent the use of chemical weapons".
"We can not tolerate the recurring use of chemical weapons, which is an immediate danger for the Syrian people and our collective security", a statement from the Elysee presidential office said.
Assad's actions, Trump said, "are not the actions of a man", but "are the crimes of a monster instead".
Amid the mounting tension, Moscow politicians last week warned the U.S. that Russian Federation would view an air strike on Syria as a war crime.
Sites hit in the strikes included an air base west of Damascus near the Lebanese border, a commander in the regional military alliance that backs Bashar al-Assad said. Barzah is the location of a major Syrian scientific research center.More news: Russian UN envoy warns against U.S. military action on Syria
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"Our strategy remains the same as a year ago: to drive this to a United Nations -brokered peace, but at the same time keep our foot on the neck of ISIS until we suffocate it", Mattis said.
"The use of chemical weapons by anyone, anywhere, under any circumstances is illegal and utterly reprehensible", Prime Minister Malcolm Turnbull said on Saturday.
"We look forward to the day when we can bring our warriors home", he said.
Some lawmakers criticized Trump's apparent telegraphing by tweet of a missile strike in Syria.
Biological samples from the area of the alleged chemical attack in Syria have tested positive for chlorine and a sarin-like nerve agent, according to a USA official familiar with the USA analysis of the test results.
The ministry also pointed at previous use of chemicals by rebels in fighting with Syrian government troops.
Representatives of the military sector of the United States, as you know, is all the more serious considering the possibility of missile strikes on eight targets in Syria. "The United States will be a partner and a friend".
"Russia vows to shoot down any and all missiles fired at Syria". Trump wrote on April 12.
"Never said when an attack on Syria would take place", the president tweeted.
Despite several tweets threatening military action against Syria by Donald Trump the U.S has yet to launch military strikes on the Assad regime. "And a significant body of information including intelligence indicates the Syrian Regime is responsible for this latest attack".