You may be aware of President Biden’s intention to revive the treaty with Iran on nuclear weapons from which his predecessor withdrew the United States. Since the Iranians are eager to bring the agreement back to life, the task should be easy, right?

Wrong. Biden wants a few changes, but Iran is insisting the original treaty, agreed to in 2015, be restored. And Iranian leaders are demanding a host of concessions to make up for the years since the pact was killed in 2018 by then-President Donald Trump.