The Syrian Observer reported that about 200,000 Iranians, mostly Revolutionary Guards Corps, have obtained Syrian passports in last few months, well-informed sources told Zaman al-Wasl.
The move assures concerns will rise over the Assad regime's policy of demographic change, as hundreds of thousands of people are being forcibly displaced and evacuated from their hometowns to northern Idlib province.
The Syrian Observatory said Tehran has sent military advisers, volunteer militias and, reportedly, thousands of fighters from its Quds Faction, the overseas arm of the IRGC, to Syria.
It is also believed to have supplied thousands of tons of weaponry and munitions to help Assad's forces and the pro-Iranian Hezbollah, which is fighting on the president's side, according to the BBC.