President Barack Obama has long been under fire from the US national security elite and the media for failing to intervene aggressively against the Assad regime. 

But the real strategic blunder was not that Barack Obama didn't launch yet another war in Syria, but that he decided to go along with the ambitions of America's Sunni allies to create and arm a Syrian opposition army to overthrow the regime in the first place.

Now a former Obama administration official who is knowledgeable on the internal discussions on Syria policy, speaking to this writer on condition of anonymity, has shed new light on how and why that fateful decision was made. 

The former official revealed that when Obama made the first move toward supporting the arming of Syrian opposition forces, the president failed to foresee the risk of a direct Iranian or Russian intervention on behalf of the Syrian regime in response to an externally armed opposition – because his advisors had failed to take this likelihood into account themselves.

The story of this policy failure begins after military resistance to the Assad regime began in spring and summer 2011.