DUBAI, United Arab Emirates — Iran's ailing economy braced Saturday for the reimposition of United Nations sanctions over its nuclear program.

Early Sunday, barring a last-minute diplomatic breakthrough, U.N. sanctions on Iran will be reimposed through "snapback," as the mechanism is called by the diplomats who negotiated it into Iran's 2015 nuclear deal with world powers. That will again freeze Iranian assets abroad, halt arms deals with Tehran and penalize development of Iran's ballistic missile program, among other measures.

Iran's currency already sits at a record low. People worry about a new round of fighting between Iran and Israel — as well as potentially the United States — as nuclear sites struck during the 12-day war in June now appear to be being rebuilt. Activists also fear

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