In an asymmetric war? The Army War College is interested in how to accomplish this.
Hard for me to talk about Iran without mentioning the total lack of a comprehensive, coherent foreign policy. [sigh]
I'm not opposed to engagement with Iran on a 'common enemy' type basis. Would potentially be a good source of intel. Plus, there's a Darmok and Jalad at Tanagra type dimension to it.
You have me totally lost on what direction Iraq was trending, unless you mean towards disintegration. In 1992 Iraq should have been split into 3 countries. In 2008, it should have been split. Now, it is splitting.
You lost me on who "they" are. Daesh competed successfully on the battlefield against trained military - Iraq, Syria, and I think Libya - and won. Not sure how to count the Kurds - maybe paramilitary?
Daesh's actions prove they are a regional threat. For now.
I said "professional," lol. The nations you mentioned have "soldiers" that barely qualify to have the label, and most given the turmoil in their nations, probably did more so to collect a paycheck, than civic duty.