A rad­i­cal Islamist group called ISIS made major advances this week in Iraq. Pres­i­dent Oba­ma is review­ing his options. Is the best bet to let Sun­ni and Shi­ite rad­i­cals fight it out? [Cred­it: AP]

The Pres­i­den­t’s illu­sion that we accom­plished our mis­sion in Iraq evap­o­rat­ed this past week, when Sun­ni mil­i­tants call­ing them­selves the Islam­ic State of Iraq and Syr­ia (ISIS) and fly­ing the black flag of Islamism over­ran Mosul and Tikrit. The embat­tled Iraqi gov­ern­ment still holds Bagh­dad, but its sov­er­eign­ty, sta­bil­i­ty and self-reliance have been exposed for the arti­fice they long have been.

The truth is that things began to unrav­el in Iraq two and a half years ago, when we declared vic­to­ry and with­drew our troops. “This is the start of the Iraqi civ­il war that was so obvi­ous­ly going to break out after we washed our hands of it,” Ken­neth M. Pol­lack of the Brook­ings Insti­tu­tion told the Wash­ing­ton Post.

Yet this lat­est in a series of for­eign pol­i­cy fail­ures may actu­al­ly work to our advan­tage.  Hav­ing Sun­ni and Shi­ite mil­i­tants and the Iran­ian Army cross­ing swords in Iraq may not be the worst thing from the per­spec­tive of US interests.

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