US President Donald Trump and his French counterpart Emmanuel Macron agreed during a telephone call on Tuesday on the need for a "joint response" in the event of another chemical attack in Syria, the French presidency said.
Their call came a day after Washington said that the Syrian regime leader Bashar al Assad may be preparing another chemical weapons attack and warned that his regime would pay a "heavy price" if it went ahead with such an assault.
The French foreign ministry refused to say whether it had information about possible preparations by the Syrian regime for a chemical attack.
A Pentagon spokesman said that the US intelligence had noticed suspect activity at the launch site of the regime's apparent chemical strike in April.
Any further attacks done to the people of Syria will be blamed on Assad, but also on Russia & Iran who support him killing his own people.
— Nikki Haley (@nikkihaley) June 27, 2017
"Clear red line"
Days after that strike on a rebel-held town, the US launched 59 Tomahawk cruise missiles on the airfield in retaliation - the first direct US attack on the Syrian regime.
After a meeting last month with Russian President Vladimir Putin, an Assad ally, Macron drew a "very clear red line" on the use of chemical weapons "by whomever" and warned of reprisals.
Mr Macron don't have problems with the chemical attacks which made by #Assad. with the barrels bomb or all massacres
is this the new France?
— Asaad Hanna (@AsaadHannaa) June 21, 2017
In August 2013, a chemical attack near Damascus brought France and the US to the brink of a joint military intervention in Syria.
But then US president Barack Obama, who had also declared that a chemical attack would cross a "red line", eventually decided against military action.
The US and Russia instead struck a deal on the destruction of Syria's chemical weapons stockpile.