United Nations sanctions on Iran over its nuclear program have been reimposed. This puts Tehran under new pressure as tensions remain high in the wider Mideast over the Israel-Hamas war in Gaza. At the U.N. General Assembly this week in New York, Iranian President Masoud Pezeshkian and Foreign Minister Abbas Araghchi tried a last-minute diplomatic push to stop the sanctions. However, Iran’s supreme leader boxed in their efforts by describing diplomacy with the United States as a “sheer dead end.” Meanwhile, efforts by China and Russia to halt the sanctions failed Friday.