Oh, no, there is extensive trade between Iran and Iraq as well as between Iran and Syria.
The question many people ask is how did we get here, how did this happen? What we're looking at overall, beyond the uprisings and the localized reasons and demographic reasons for the uprisings, is that the Islamic Republic has been expanding its influence in the region militarily and in terms of investment for decades and it has been building slowly in fits and starts. That has then oftentimes angered elites among traditionally Sunni Arabs but also in Sunni countries. So in the context of the uprisings, Iran has involved itself in these environments militarily through proxy forces and the Quds force to back up regimes that oftentimes have little legitimacy but have legal legitimacy in the international community.
I think overall that's what is causing these and generating the uprisings and the extreme reaction on the part of ISIL which represents, at least partially, the Sunni society's response to that encroachment on Arab territories.