Four RAF Tornados took off from RAF Akrotiri in Cyprus in the early hours and struck regime facilities linked to the production and use of chemical weapons.
French Mirage and Rafale fighter jets were involved in air strikes on Syria together with four frigate warships, a presidency source said on Saturday.
French President Emmanuel Macron gestures as he speaks at the Elysee presidential palace on April 13, 2018 in Paris. Macron did not describe the evidence or say how France got it.
Meanwhile, Trump has softened his rhetoric against Russian Federation and Syria, seeming to indicate in a tweet Thursday morning that an attack on Assad's regime was not imminent.
At the same time, Macron is trying to reinforce France's position as an enforcer of global treaties, which includes the Chemical Weapons Convention that 192 countries have signed.
"Never said when an attack on Syria would take place", Trump tweeted. "Could be very soon or not so soon at all!" he said on Twitter.
French President Emmanuel Macron said his "red line" had been crossed by the Syrian regime as he launched airstrikes on the country alongside the U.S. and United Kingdom today.
He did not say whether France is planning military action against Assad's government.
The French leader, however, said on Thursday he would decide "in due course" whether to strike Syria.
Opinion polls suggested that the British public's support for strikes was lukewarm.
The Syrian government has denied the allegation and called the reports fake news used by the West to justify its attacks on Syria.
He said: "France will in no way allow an escalation or anything that would harm regional stability, but we cannot allow regimes that believe they can act with impunity to violate worldwide law in the worst possible way".
Much of the commentary in France over the past week has focused on whether the country could forge ahead by itself in Syria if Trump follows through on his pledge to withdraw USA forces from the country.
'The red line set by France in May 2017 has been crossed, ' he said.
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