French President Emmanuel Macron defended his decision to join the operation in a statement shortly after the strike was launched late Friday, stressing that France's participation was limited to "the capabilities of the Syrian regime for the production and use of chemical weapons".
Macron said the strikes were legal and an act to implement global resolutions and enforce worldwide law and not to declare war on Syrian regime.
France used its Rafale jets to target chemical research and storage sites in a Damascus suburb in Syria after Macron had said, "The red line had been crossed".
The allies fired missiles early Saturday at three chemical-weapons facilities in Syria to punish the regime for the alleged use of chemical weapons in the town of Douma. "I assure you, we have convinced him that it is necessary to stay for the long-term".
On Friday, Trump said that the U.S. is "prepared to sustain this response until the Syrian regime stops its use of prohibited chemical agents".
And he further argued that the operation was legitimate despite not being sanctioned by the United Nations, retorting that under a 2013 United Nations resolution Syria was supposed to destroy its chemical weapons arsenal.
Speaking in a live TV interview, during which he was grilled on several subjects, Macron said: "Ten days ago, President Trump was saying "the United States should withdraw from Syria". "We convinced him that it was necessary to stay".
After Macron's comments, White House spokeswoman Sarah Sanders said: "The US mission has not changed - the president has been clear that he wants US forces to come home as quickly as possible". "We are determined to completely crush ISIS and create the conditions that will prevent its return. In addition we expect our regional allies and partners to take greater responsibility both militarily and financially for securing the region", she added.
Le Drian insisted it was important to continue talking to Russian Federation, and that Macron's trip to St. Petersburg at the end of May would go ahead as planned. In telephone calls with Trump, he also said he "persuaded him that we needed to limit the strikes to chemical weapons [sites], after things got a little carried away over tweets".
"The president immediately realized the seriousness of these attacks", the first advisor said.