Johnson backed Prime Minister Theresa May's decision to join the United States and France to strike chemical weapons facilities in Syria on Saturday, saying it was the right thing to do to deter the further use of chemical weapons.
Assad denies he has used chemical weapons, and the Trump administration has yet to present hard evidence of what it says precipitated the allied missiles attack: a chlorine gas attack on civilians in Douma on April 7.
The US said the overnight missile attacks have crippled Bashar al-Assad's chemical weaponry. He added, "So proud of our great Military which will soon be, after the spending of billions of fully approved dollars, the finest that our Country has ever had".
Russian Federation and Iran called the use of force by the United States and its French and British allies a "military crime" and "act of aggression".
Nizar Makni, a Tunisian analyst specializing in the Middle East and North Africa region, said the strike is a direct reaction to Bashar al-Assad's domination of the Ghouta, which is the main front for all attempts to overthrow the ruling government in the depths of the capital Damascus.
"Trump failed in his aggression", said 51-year-old civil servant Mohammed Hammad.
On Monday, White House officials said Mr. Trump had not yet decided whether to impose sanctions on Russian companies found to be assisting Syria's chemical weapons program.
Last Sunday, the pope denounced a reported gas attack in Syria as an unjustifiable use of "instruments of extermination". The NATO alliance gave its full backing; NATO Secretary-General Jens Stoltenberg said the attack was about ensuring that chemical weapons can not be used with impunity.
Very Warm Today, but Storms on Sunday
We will have to keep an eye out for the potential of some slick roads during the Saturday night into Sunday morning period. Rain will change to snow from west to east during the morning hours and continue as snow the rest of the day.
"No Syrian weapons had any affect on anything we did", the Pentagon said Saturday morning.
"To be clear, the United States is also ready to take additional action in a sustained way to ensure that Syria understands that there will be a price to pay if they ever use chemical weapons again", he said from Peru.
Responding to Haley's remarks about the plans for new sanctions, Evgeny Serebrennikov, deputy head of the defence committee of Russia's upper house of parliament, said Moscow was ready for the penalties, according to RIA news agency.
"We convinced him to limit the strikes to chemical weapons when at the same time there was a burst of tweets that did not escape you", Macron said.
"In a sign of cynical disdain, a group of countries chose to take military action", Russia's UN Ambassador Vassily Nebenzia said. What happens next, she said, is up to Assad and to his Russian and Iranian allies. California Representative Ro Khanna called Trump's strike on Syria "unconstitutional" and observed that "our call for regime change in 2011 made the crisis worse".
Nasr al-Hariri, a senior opposition leader, said the global community must take responsibility for any retaliation by the Syrian government against civilians in opposition areas.
OPCW stands for the Organization for the Prohibition of Chemical Weapons.
Soussan reiterated a pledge by the Syrian government that the chemical experts would be allow to investigate unimpeded.