As May and Macron face critics at home, their representatives to the United Nations will, with the USA, push Monday for a resolution calling for an investigation into the alleged chemical weapons attack.
The official said Trump was concerned that immediately imposing more sanctions, on the heels of last weekend's USA -led strike against Russian-backed Assad, would interfere with his efforts to negotiate agreements with Russian President Vladimir Putin on combating Islamic extremism, policing the internet and other issues.
Russian Foreign Minister Sergey Lavrov said that evidence cited by the United States, Britain and France to justify Saturday's missile attack was based "on media reports and social media".
The OPCW itself had declared that the Syrian government's chemical weapons stockpile had been removed in 2014, only to confirm later that sarin was used in a 2017 attack in the northern town of Khan Sheikhun.
A team from the OPCW arrived in Syria shortly before the air strikes.
Kenneth Ward, the USA ambassador to the OPCW, raised these fears on Monday, drawing a denial from the Russian foreign minster, Sergei Lavrov, who told the BBC: "I can guarantee that Russia has not tampered with the site".
"You will see that Russian sanctions will be coming down", she said. "I think they're feeling that". Some estimate that up to 500 people-mainly women and children-were hospitalized by the gas attack, which is said to have been carried out by the government of Bashar al-Assad.
"The Elysee confirms that a disciplinary procedure for withdrawing the Legion d'Honneur (Legion of Honor) is under way", Macron's office said.More news: Let's Set Some Odds On Who Will Die In 'Avengers: Infinity War'
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The President was reportedly persuaded by Mattis to focus on Syria's chemical weapons capabilities, although he and Haley were eager for the talks to consider strikes on Russian and Iranian targets.
According to reports from the Pentagon, the joint forces hit the Barzah Research and Development Center outside Damascus with 76 missiles, destroying the facility.
It branded the incident an "aggression" but did not name a specific country. "Unfettered access essential. Russia & Syria must cooperate", the delegation tweeted.
"Last night, a false alarm that Syrian air space had been penetrated triggered the blowing of air defence sirens and the firing of several missiles", a military source told the agency. And it shouldn't just be us doing it. An already difficult battle plan - which required hitting Assad without provoking Russian reprisals or injecting the USA further into Syria's seven-year civil war - was getting harder.
"After seven years of war, we don't believe that anyone will come to help the Syrian people anymore", he said.
"There are certainly various asymmetric means through which Russia, Syria and Iran could respond inside Syria or outside", said Heller.
In an exclusive interview with Xinhua, Makni said the strike has reflected that a tactical maneuver, which was against the epicenter of the Syria-Russia-Iran triangular alliance that manages to suppress rebel armed groups.
"As it is, even with this latest bombing, the West does not have a seat at the table", said the former USA diplomat, now a fellow at the Atlantic Council think-tank.