The chemical attack on Monday killed at least 80 people in the northwestern part of Syria and led to the U.S. launching more than 50 Tomahawk missiles from warships stationed in the Mediterranean at a Syrian airfield.
Dozens of representatives of the media, local authorities, fire departments, police, and the Syrian military have visited the airfield since then, with no alleged "storage units" or any chemical shells having been found, he said.
Mr Johnson had been due in the Russian capital on Monday but will stay away as G7 foreign ministers draw up their coordinated response.
Cavusoglu said after the transitional government takes over, it will be followed with elections in which Syrians in the country and overseas can vote.
He said that safe zones for civilians in Syria were now more important than ever.
He said the coalition had been informed of the USA missile strike and that he had spoken by phone with the French and German foreign ministers, although he did not say when. "Russia, Iran, and the United States are all hitting us from different sides", Mustafa said, his right arm still in a sling.
Elsewhere in Syria, a pair of activist groups reported that a US -led coalition airstrike hit a boat carrying civilians fleeing across the Euphrates River, killing seven members of the same family.
In an interview to air Sunday on CBS' "Face the Nation", Tillerson says Russians were not targeted by the strikes.
"Lavrov stressed that an attack on a country whose government is fighting terrorism only plays into the hands of extremists [and] creates additional threats to regional and global security", it said.
The United States blasted a Syrian air base with a barrage of cruise missiles in fiery retaliation for this week's gruesome chemical weapons attack against civilians. It said the woman killed had fled to the town from her hometown of Latameh in central Syria.
The official Saudi Press Agency is reporting that U.S. President Donald Trump has spoken by telephone with King Salman about the U.S. missile strike on Syria.