In Iran Nuclear Talks, Familiar Cast of Characters Faces Fresh Problems

When American and Iranian officials resume talks in Vienna on reviving the 2015 international nuclear deal, the people driving the diplomacy are a familiar cast of characters, including some of the key figures who negotiated the original accord working to put it back together again.

But if the participants in Tuesday’s discussions are familiar, the context for the talks has changed sharply, as have some of the two sides’ objectives. And while the steps needed for Washington and Tehran to return to their commitments are relatively clear, the diplomatic choreography...