"... for Iran containment seems only viable option..."

WaPo/ here

"After months of first attempting to engage Iran and then wooing Russia and China to support new sanctions against the Islamic republic, the Obama administration appears within reach of winning a modest tightening of U.N. measures targeting Tehran. But administration officials acknowledge that even what they call "crippling" sanctions could prove ineffective in keeping Iran from developing nuclear weapons.

That stalemate, in the view of many analysts, means that a strategy of containing Iran is inevitable -- diplomatic isolation backed by defense systems supplied to Persian Gulf allies...."