His foreign policy, far from a dismal failure, is a brilliant success as measured by what he intended all along to accomplish. The accomplishment would not have been possible if the intention had been too obvious. The skill lies in how effectively he has used rhetorical tricks to disguise it.

The key to understanding what Mr. Obama has pulled off is the astonishing statement he made in the week before being elected president: "We are five days away from fundamentally transforming the United States of America." To those of us who took this declaration seriously, it meant that Mr. Obama really was the left-wing radical he seemed to be, given his associations with the likes of the anti-American preacher Jeremiah Wright and the unrepentant terrorist Bill Ayers, not to mention the intellectual influence over him of Saul Alinsky, the original "community organizer."

As a left-wing radical, Mr. Obama believed that the United States had almost always been a retrograde and destructive force in world affairs. Accordingly, the fundamental transformation he wished to achieve here was to reduce the country's power and influence. And just as he had to fend off the still-toxic socialist label at home, so he had to take care not to be stuck with the equally toxic "isolationist" label abroad.

This he did by camouflaging his retreats from the responsibilities bred by foreign entanglements as a new form of "engagement." At the same time, he relied on the war-weariness of the American people and the rise of isolationist sentiment (which, to be sure, dared not speak its name) on the left and right to get away with drastic cuts in the defense budget, with exiting entirely from Iraq and Afghanistan, and with "leading from behind" or using drones instead of troops whenever he was politically forced into military action.

The consequent erosion of American power was going very nicely when the unfortunately named Arab Spring presented the president with several juicy opportunities to speed up the process. First in Egypt, his incoherent moves resulted in a complete loss of American influence, and now, thanks to his handling of the Syrian crisis, he is bringing about a greater diminution of American power than he probably envisaged even in his wildest radical dreams.