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WASHINGTON — As President Obama faces pressure to back up his year-end ultimatum for diplomatic progress with Iran, the administration says that domestic unrest and signs of unexpected trouble in Tehran’s nuclear program make its leaders particularly vulnerable to strong and immediate new sanctions.force Iran to comply with United Nations demands to halt production of nuclear fuel. It comes as the administration has completed a fresh review of Iran’s nuclear progress.

In interviews, Mr. Obama’s strategists said that while Iran’s top political and military leaders remained determined to develop nuclear weapons, they were distracted by turmoil in the streets and political infighting, and that the drive to produce nuclear f... >>>