>>440>there's no doubt that Turkey and Saudi's direct and still continuous support of insurgents in this proxy-warFirst off, no country directs IS. You fundamentally misunderstand the group, if you believe this. Not even al-Qaeda can influence the leadership. I would encourage you to read up on the subject. Will McCant's new book is pretty good at capturing their MO.
As for tacit support, no other country aids and abets the IS group to the degree of Assad. There is a clear difference between IS and Ansar al-Islam and even JaN.
As for 3 years ago, the US was not anywhere near Syria and IS was nothing. Before IS was IS it was AQI and the US totally destroyed the group (in spite of the fact that Assad was funneling them to kill Americans in the Iraq War). As far as 3 years ago I have no idea what you're talking about.
Finally, Iraq was strong and capable when the US left. The CPA gave the government a highly profitable oil operation and an effective army. That Malaki turned one into a Nigerian-tier bureaucracy and the other into a historical arab-tier army has nothing to do with the US.