Foreign Minister Jean-Marc Ayrault said France made the conclusion after comparing samples from a sarin attack in Syria in 2013 that matched the new ones.
French intelligence services have scientific proof that the Syrian regime was responsible for a suspected chemical attack that killed 87 people, France's foreign minister said on Wednesday.
Analysis by French experts of samples from the April 4 attack site and the blood of one of the victims confirmed the use of Sarin, its report said.
Syrian President Bashar al-Assad, backed by his ally Russian Federation, has strongly denied allegations that his forces used chemical weapons against the town, describing it as a "100 percent fabrication".
Ayrault said the chemical fingerprint is "typical of the method developed in Syrian laboratories".
"This method bears the signature of the regime and that is what allows us to establish its responsibility in this attack", he added, saying that France is working to bring those behind the "criminal" atrocities to global justice.
The sanctions listings are the latest action taken by the Trump Administration in response to the April 4 chemical attack on Khan Sheikhoun that US authorities say killed almost 90 people, including children.
After the chemical attack on April 4, the United States launched 59 Tomahawk missiles at a Syrian government airbase. "Only the regime has such air assets", said Ayrault.
Syrian President Bashar al-Assad insisted the government never used chemical weapons and that it turned over all of its stocks in 2013, after it was blamed for a sarin attack on rebel-held suburbs of Damascus that left hundreds dead. It said that information will be made public, without offering details.
US Defence Secretary Jim Mattis said on Friday there was "no doubt" Syria has retained some chemical weapons and warned Assad's regime not to use them. However, Washington came to the conclusion that Damascus had used chemical weapons which led the U.S. to carry out a missile attack on a Syrian military air base located in the Homs Governorate on April 7, as the U.S. believes that the attack on Khan Shaykhun was launched from there.
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Kamm said he was told by "people who were in the room" that Tillerson pressed Phan-Gillis' case in private meetings. Her husband, Jeff Gillis, declined to comment other than to say: "I will just be happy if we can bring Sandy home".
In other developments, the USA -backed Syrian Kurdish forces asked for the US -led coalition to provide air cover over northern Syria, to protect them from Turkish and Syrian government air raids.
He also dismissed claims that worldwide experts can not visit the site in Khan Sheikhoun because of security precautions and criticized the OPCW for failing to go there.
The new sanctions are a response to the deadly April 4 chemical attack in Khan Shaykhun, an attack the US government accuses Assad of carrying out against civilians.
Earlier Wednesday, Russian Foreign Minister Sergey Lavrov said the USA strike damaged the prospects of a political settlement for the war-torn country.
The Trump administration will issue new sanctions against Syria as early as Monday as part of its ongoing crackdown on the Syrian government and those who support it.
Lavrov says claims that the experts were warned by a United Nations body against traveling there because it's unsafe are "lies", adding that Moscow went back to the United Nations and found out that there was no such warning.
Lavrov told a security conference on Wednesday the attack as a pretext for a regime change in Syria and said the USA response "pushes the prospect for a wide global front on terror even further away".
Separate air strikes southwest of Kafr Takharim killed at least 12 people including civilians and rebel fighters, the Observatory said.
The SDC is the political arm of the Syrian Democratic Forces, the U.S.'s main partner in the struggle to defeat the Islamic State group in northern Syria.
Turkey says one of the Kurdish groups represented in the SDF is an extension of an outlawed insurgent Kurdish group within its own borders.
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