Iranian President Mahmoud Ahmadinejad, meanwhile, said Iran remains open to a nuclear fuel swap. Under the long-discussed plan, Iran would send enriched uranium abroad in return for nuclear fuel to power a reactor for medical use. Iran appeared to have rejected the proposal last year. But on Tuesday, Ahmadinejad said, “We are still ready for an exchange, even with America.” Ahmadinejad also warned against imposing new sanctions against his government, saying, “Our response will not be like before.”