DUBAI, United Arab Emirates — United Nations sanctions on Iran over its nuclear program were reimposed Sunday, putting 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 last 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 Ayatollah Ali Khamenei 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.

A 30-day clock for the sanctions started when France, Germany and the United Kingdom on Aug. 28 declared Iran wasn’t complying with its 2015 nuclear deal with world p

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