US is arming ISIS, Kurds, Al-Nusra with weapons from Eastern Europe
Link: https://www.theguardian.com/world/2016/jul/27/weapons-flowing-eastern-europe-middle-east-revealed-arms-trade-syria

Billions of dollars spent on old Soviet-era hardware. Saudis and Qatar are paying for it. Just ask yourself, why Saudis buying up all those Russian standard weapons if they cannot be used by Saudi arms forces? 

And then US-supplied TOW anti-tank missiles ended up in the hands of ISIS
http://www.washingtontimes.com/news/2016/nov/2/iraqi-army-finds-isis-us-missiles/
(there are MANY links )

Lastly, what happened to Libya's  chemical weapons stockpiles? I bet one of those will explode somewhere in Syria to give US cart-blanche to attack SAA forces - most likely at the border with Iraq where US proxies lost the race to secure border.

What are the US forces doing on the Jordan/Syria border anyway? There is no ISIS left (green area on the map)
https://pbs.twimg.com/media/DDQmAy7XsAAzARi.jpg:large