The three countries had carried out a wave of pre-dawn missile strikes, hitting targets near Damascus and in Homs province, Western officials said.
The US and its allies fired more than 100 cruise missiles at Syria, a significant number of which were intercepted by Syrian air defences, the Russian defence ministry said today.
France wants to start working "right now" on resuming the political process aimed at ending the conflict in Syria.
The strikes came a week after an alleged gas attack that killed more than 40 people outside Damascus, but which Syria said was a "fabrication" intended to justify military action.
Syria airstrikes UPDATES | Trump calls it 'perfectly executed strike'; UN Security Council rejects Russian attempt to condemn US aggression
As Trump announced actions against the Syrian government, explosions were heard in the Syrian capital Damascus, signalling a new chapter in a brutal seven-year-old civil war.
Macron issued a statement shortly after huge explosions were heard in Syria's capital early Saturday.
Theresa May announced that Britain had joined France and the United States in launching strikes against Syria.
The US and its allies believe the Syrian regime was behind the attack, but Russia has long insisted it was staged by rebels in an attempt to provoke further Western intervention.
The Cabinet agreed on the need to take action to alleviate humanitarian distress and to deter the further use of chemical weapons by the Assad regime.
The OPCW decided to dispatch a fact-finding mission to the town after reports that more than 40 people died from exposure to toxic gas at the weekend.
Erdogan said he is extremely worried that some countries confident of their military power are turning Syria into a scene for arm wrestling.
Germany expects to be consulted before any Western allies conduct an attack on Syrian President Bashar al-Assad's forces as the allies must be united on the matter, Foreign Minister Heiko Maas.
Trump is believed to be considering standoff missile strikes against facilities related to the production and delivery of chlorine and sarin or sarin-like agents.
Describing them as "intelligence officers", US ordered closure of the country's consulate in Seattle over the use of nerve agent allegedly by Moscow against a former Russian spy in the UK.
Since the start of the Syrian conflict, President Bashar al-Assad -- have been accused on numerous occasions of using chemical weapons.