A draft resolution obtained by AFP yesterday calls for asset freezes and travel bans against four Syrian officials and 10 entities including a Syrian research center tied to chemical weapons development.
Diplomats however said the measure is certain to be vetoed by Russia, Syria's ally, which has blocked council action on Syria with six vetoes so far.
A vote at the council is expected as early as next week.
It was the first time an international probe blamed President Bashar Al-Assad's forces after years of denial from Damascus.
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Government helicopters flying from two regime-controlled air bases dropped chlorine barrel-bombs on the villages of Qmenas, Talmenes and Sarmin, the panel's latest report said.
Chlorine use as a weapon is banned under the Chemical Weapons Convention, which Syria joined in 2013 under pressure from Russia.
"We'll be pursuing that with our council colleagues and circulating a draft shortly," he told reporters.
Russia however has said that the report's findings are "inconclusive" and not strong enough to warrant sanctions.
Under the proposed measure, the council would demand that all UN member-states "prevent the direct or indirect supply, sale or transfer" to the Syrian military and government of "any helicopters, or related materiel including spare parts."
A UN committee that oversees a sanctions blacklist for Al-Qaeda and the Islamic State would also be tasked with adding names of those responsible for a mustard gas attack in Syria in 2015.
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