President Emmanuel Macron’s efforts to stitch together a deal with Iran to stop the 2015 nuclear accord from collapsing was hanging by threads Friday — but not yet broken, despite Tehran’s announced plans to step farther back from its international commitments. Iran was poised to begin work on advanced centrifuges that will enrich uranium faster with no solution from Europe to provide a way to revive the deal ahead of the Friday deadline — the third incremental breach of the accord. Europe called on Iran to pull back from the slippery slope that could undo the accord completely.
