Three weeks ago, in a show of both good faith and diplomatic pressure, the United States offered to rejoin nuclear talks with Iran . The double-edged overture fell flat: Iran refused to meet without first receiving financial incentives, and the Biden administration made clear, as the White House national security adviser, Jake Sullivan, put it, that “ the ball is in their court .” That set off a new rush among world powers to resuscitate a 2015 nuclear accord that the United States exited three years after negotiating it, leaving Iran to steadily violate the terms of the deal. Diplomats from Britain, France and Germany have since urged Iran to accept a joint European-American invitation on Feb. 18 to begin informal negotiations. Officials from China and Russia have taken a more sympathetic approach in asking Tehran in recent days to return to talks. President Hassan Rouhani of […]