Rebels in Syria's Idlib train in case of a regime offensive Rebel fighters from the newly-formed National Liberation Front are training in Idlib in the event of a military offensive by the Syrian regime and its Russian ally on the country's last rebel stronghold. Meanwhile, United Nations Secretary-General Antonio Guterres has warned Syria and its backers against launching a full-scale battle in Idlib, saying the province "must not be transformed into a bloodbath."