What world do you live in?  It is well known, even admitted by Assad and Russia that Syria had chemical weapons and that credible reports document the use of these weapons in the past.  Second, chemical weapons are stored as separate compounds so that they are inert should a leak or bombing release the chemicals.  
The only fake news is that Russia oversaw the destruction of the chemical weapons arsenal. Clearly, this did not happen.
Of course, if Obama had the any guts he would have taken our Assad when he said he would.