Iran sees American demands as reaching far beyond what the United States achieved in war. Tehran is gambling that it can withstand further bombardment more than Washington is willing to sustain economic chaos, experts say. A billboard of Mojtaba Khamenei, Iran’s supreme leader, on Saturday in Tehran. Iranian officials argue that the United States did not actually want to negotiate during talks this weekend in Pakistan.Credit...Arash Khamooshi for The New York Times Vice President JD Vance...