 It appeared in a Presidential statement on 20 August 2012.Obama's red line was enforced by means of threat of massive military force in September 2013 and resulted in the substantial destruction of the Syrian stockpile of chemical weapons by June 2014.Obama stated, "We have been very clear to the Assad regime, but also to other players on the ground, that a red line for us is we start seeing a whole bunch of chemical weapons moving around or being utilized.