Turkey has troops on the ground in northwest Syria, and provides support to some of the rebels who were intending to take part, including the Syrian National Army (SNA) - though it considers the main faction in the alliance, Hayat Tahrir al-Sham (HTS), to be a terror group. The rebels' bold plan was the brainchild of HTS and its leader Ahmed al-Sharaa, better known as Abu Mohammed al-Golani, the diplomat said. Because of his former ties to al Qaeda, Golani is designated as a terrorist by Washington, Europe and Turkey. However, over the past decade, HTS, previously known as the Nusra Front, has tried to moderate its image, while running a quasi-state centered on Idlib, where, experts say, it levied taxes on commercial activities and the population.