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Syrian rebel fighters from the recently-formed "National Liberation Front" parade following military training at an unknown location in the northern countryside of the Idlib province on September 11, 2018, in anticipation for an upcoming government forces offensive. - The Syrian regime and its Russian ally are threatening an offensive to retake the northwestern province of Idlib, Syria's last rebel bastion. (Photo by Aaref WATAD / AFP) (Photo credit should read AAREF WATAD/AFP via Getty Images)

Syrian rebel fighters from the recently-formed "National Liberation Front" parade following military training at an unknown location in the northern countryside of the Idlib province on September 11, 2018, in anticipation for an upcoming government forces offensive. - The Syrian regime and its Russian ally are threatening an offensive to retake the northwestern province of Idlib, Syria's last rebel bastion. (Photo by Aaref WATAD / AFP)        (Photo credit should read AAREF WATAD/AFP via Getty Images)