She will say United Nations inspectors found Syrian president Bashar al-Assad's government responsible for four previous chemical weapons attacks and that she is confident it was "highly likely" to have been behind last week's attack in Douma, which killed up to 75 people. Three civilians were injured in the attack.
The bombings marked the biggest intervention by Western countries against Assad and ally Russian Federation.
Macron, speaking on French television BFM and online site Mediapart, said "we are preparing a political solution" aiming at allowing a political solution for Syria. President Donald Trump immediately said that Syrian President Bashar al-Assad would pay a "big price" and blamed both Russian Federation and Iran for supporting the Assad regime.
'It is in our national interest to prevent the further use of chemical weapons in Syria - and to uphold and defend the global consensus that these weapons should not be used.
The White House pushed back against Macron's comments about Trump's intentions for U.S. forces.
Mr. Trump, who only weeks ago said he wants to pull US troops out of Syria - there are roughly 2,000 there now - said Friday night the strike does not mean the USA does not seek an "indefinite" presence in Syria.
"Stepping up support for Assad so he has cover to keep doing this, being more hostile in Eastern Europe, things like that we might want to be anxious about", he said. "In addition we expect our regional allies and partners to take greater responsibility both militarily and financially for securing the region".
"They are hard for us, but will do more damage to the United States of America and Europe", RIA quoted Serebrennikov as saying.
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US Ambassador to the UN Nikki Haley responded, saying she'd spoken with Trump hours earlier and he'd told her, "If the Syrian regime uses this poisonous gas again, the United States is locked and loaded".
Over the weekend the OPCW sent inspectors on a fact-finding visit to Douma to search for evidence and interview witnesses.
Moscow condemned the Western states for refusing to wait for OPCW's findings before attacking.
According to several analysts, the strikes have achieved one goal only: not to provoke Russian forces in Syria, thus minimising any possibility of an escalation between Moscow and Washington.
Pentagon spokesman Lt. Gen. Kenneth McKenzie denied reports that Syrian air defence systems had take down 71 of the missiles launched and said that all 105 had reached their targets.
A statement adopted by the 28 European Union foreign ministers at the meeting said, "We strongly condemn the continued and repeated use of chemical weapons by the regime in Syria, including the latest attack in Douma, which is a grave breach of worldwide law and an affront to human decency". That makes degrading it through military strikes far more hard.
In a statement to Parliament on her decision, Ms May said the strikes were "legal and moral". "Better than a military strike would be serious discussions between the US and Russian Federation on ending the conflict".
The UK has accused Syria and Russian Federation of preventing independent chemical weapons experts from entering the city of Douma, hit by a suspected gas attack that Western leaders have blamed on the Syrian government. However, the vote was rejected by the council.