"Given the context of the recent worldwide response to the use of a nerve agent in the United Kingdom, the clear targeted objective of the strikes, and the repeated blocking by Russian Federation of diplomatic solutions through the UN, we believe the Prime Minister was justified in standing with our American and French allies in this concerted action".
"The overwhelming why this was the right thing to do, and that is to deter the use of chemical weapons - not just by the Assad regime - but around the world", Mr Johnson said.
"The prime minister has the full authority, on the basis of all the information at her disposal, to order the type of military action which has been carried out this morning and we reject any suggestion that she was not entitled to do so".
Britain's defense ministry said initial indications were that the precision weapons and meticulous target planning had "resulted in a successful attack".
The Russian embassy noted that "the gist of British reasoning is that the whole worldwide community recognizes that a "new" chemical attack in Syria is imminent and that only the air strikes could prevent it".
Mr Corbyn said that if Britain wants to "get the moral high ground around the world" it must abide by global law for taking military action.
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She said she authorized British forces to join in the strikes after intelligence indicated Syrian president Bashar al-Assad's government was responsible for an attack using chemical weapons in the Damascus suburb of Douma a week ago.
The former missile base was assessed to have been used by the Syrian regime to "keep chemical weapon precursors stockpiled in breach of Syria's obligations under the Chemical Weapons Convention", the MoD said in a statement.
Much of the criticism will come from opposition lawmakers, but the prime minister may also have to work hard to defend her speed of action to members of her own Conservative Party who had wanted parliament recalled.
British Prime Minister Theresa May described the strike as "limited and targeted".
Under the UN Charter, the United Nations has the primary responsibility for maintaining worldwide peace and security. "These risks are a feature of modern confrontation".
Professor Iain Begg, Research Fellow at the European Institute and Co-Director of the Dahrendorf Forum at the London School of Economics and Political Science (LSE), told Xinhua: "A volley of bombs may help the USA and its allies feel they have reacted in a timely and proportionate manner to the undoubted horror of the use by the Syrian regime of chemical weapons, but the inevitable worry will be that they have not thought through what happens next".