US Syria strike: Trump reasons out why runways were not hit
"We will respond strongly to any aggression on Syria", the two Syrian allies said in a joint statement that flashed in a banner on Syrian state television.
Mr Johnson had been due in the Russian capital on Monday but will stay away as G7 foreign ministers draw up their coordinated response.
"Russian intelligence may not be as good as ours, but it's good enough to know the Syrians had chemical weapons, were using chemical weapons".
"My priority is now to continue contact with the United States and others in the run-up to the G7 meeting on 10-11 April - to build coordinated global support for a ceasefire on the ground and an intensified political process", Johnson said.
Saudi Arabia hailed the strike as a "courageous decision" by President Donald Trump and a Saudi ally, the United Arab Emirates echoed that support.
He added: "We're not done".
Mr Johnson has been lambasted for pulling out of planned talks with Russian counterpart Sergey Lavrov following discussions with the US.
Talking with ABC's This Week host George Stephanopoulos, the official, who is set to visit Moscow April 11-12, said he would "call upon Foreign Minister Lavrov and the Russian government to fulfill the obligation it made to the worldwide community when it agreed to be the guarantor of the elimination of chemical weapons".
"Three months ago Syria wasn't really an issue for them but our push and recent events have made a difference".
President Recep Tayyip Erdogan on Saturday asked Russian Federation to reconsider its support for the Syrian regime following a chemical weapons attack in Idlib earlier this week and the U.S.'s military action in response.
Sunday on CBS's "Face the Nation", Sen.
Russia's failures to rid Syria of weapons stockpiles "has led to the killing of more children and innocents", he said.
"I'm a strong supporter that the USA should take action to protect humanitarian causes like the ban on use of chemical weapons".
Syrian forces launched further air strikes on Saturday, which killed 18 people - including five children - in the rebel-controlled Idlib province, the Syrian Observatory for Human Rights and the civil defence rescue service reported.
Earlier on Sunday, Mr Trump's national security adviser Herbert HR McMaster said defeating IS and removing the Syrian president were the country's dual goals.