Islamic extremists have seized control of Fallujah, Mosul, Iraq's second city, and Tikrit with what seems bewildering speed. Now, emboldened, they are talking of marching on Baghdad. The United States' belief of a "sovereign, stable and self-reliant" Iraq, enunciated less than three years ago by President Barack Obama when the last American troops left the country, lies in tatters.
Yet neither the success of the Islamic State of Iraq and al-Sham forces nor the swiftness of their advance should come as big surprises. The seeds for such a development were sown as soon as Saddam Hussein was toppled.
The creation of a stable and thriving Iraq was always going to depend on the country's ethnic and religious groups being persuaded that compromise and consensus was in their interests. Much of that, in turn, relied on the new Iraqi administration being able to demonstrate that it could govern strongly and effectively. While the Americans were propping up that government, limited progress was made. However, a virtual civil war in 2006-7 between the Shiites, who comprise 60 per cent of the population, and the Sunnis, who have ruled Iraq for most of the past century, re-emphasised the inherent potential for conflict.
With the withdrawal of the US forces, it soon became clear that neither of the prerequisites for a stable Iraq was being met. Prime Minister Nouri al-Maliki has been a failure.
In parliamentary elections in April, his Shiite-dominated political bloc failed to gain a majority, prompting paralysis. The degree of his impotence was demonstrated last week when he could not assemble a quorum to ask parliament to declare a state of emergency. His administration is riddled with corruption and, most damagingly, has ruled increasingly in the interests of the Shiites.