Many observers have overlooked some of the ancillary regional consequences of the U.S.-Iran deal. As the United States and Iran reached the agreement, Washington encountered trouble with Iran's eastern neighbor, Afghanistan. Afghan President Hamid Karzai would not sign the bilateral security agreement that would authorize a residual American force in Afghanistan after 2014. The standoff will be short-lived, but in light of the U.S.-Iran deal, battles will continue to take place in Afghanistan between two historic rivals: Saudi Arabia and Iran, which is now poised to play an unprecedented role in the region. U.S. National Security Adviser Susan Rice left Kabul on Tuesday after warning Karzai that if he did not sign the bilateral security agreement Washington would have to withdraw all of its troops from Afghanistan by the end of next year. That probably will not come to pass; Karzai is simply posturing to get additional concessions from Washington, many of which involve Karzai tryin...
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