U.S. looks at dropping key Iran provision

The Obama administration and European allies may shift strategy toward Iran, dropping American insistence that Tehran shut down nuclear facilities during early phases of negotiations over its atomic program.  Matthew Bunn of the Ploughshares-funded Belfer Center said the administration had some latitude in defining what constitutes “suspension” of nuclear work. One possibility, he said, was “what you call warm shutdown,” in which the centrifuges keep spinning without producing new enriched uranium, akin to leaving a car running in park. The option would allow both sides to claim victory.