The report, seen by Reuters on Thursday, is likely to be published this month.
The report comes as diplomats expect the United States to seek the removal of U.N. sanctions on HTS and Sharaa, who has said he wants to build an inclusive and democratic Syria.
Since May 2014, HTS has been subject to U.N. sanctions including a global assets freeze and arms embargo. A number of HTS members also face sanctions like a travel ban and asset freeze - including Sharaa, who has been listed since July 2013.
U.S. President Donald Trump announced a major U.S. policy shift in May when he said he would lift U.S. sanctions on Syria. He signed an executive order enacting this at the end of June, and Washington revoked its foreign terrorist organization designation of HTS this week.
The U.S. is “reviewing our remaining terrorist designations related to HTS and Syria and their placement on the U.N. sanctions list,“ a State Department spokesperson told Reuters.
Trump and his advisers have argued that doing so would also serve U.S. interests by opening opportunities for American businesses, countering Iranian and Russian influence and potentially limiting the call for U.S. military involvement in the region.
But Washington faces diplomatic obstacles to get Security Council backing for removing the sanctions.
Both are particularly concerned about foreigners who joined HTS during the 13-year war between rebel groups and Assad. The U.N. experts said there were estimated to be more than 5,000 foreign fighters in Syria.
“China is gravely concerned about such developments. The Syrian interim authorities should earnestly fulfill their counter-terrorism obligations,“ China’s U.N. Ambassador Fu Cong told the Security Council last month.
The U.N. monitors said some foreign fighters rejected the move to integrate them into the military. “Defections occurred among those who see Sharaa as a sell-out, raising the risk of internal conflict and making Sharaa a potential target,“ the U.N. experts said.
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