The United Nations reimposed sanctions on Iran early Sunday over its nuclear program, further squeezing the Islamic Republic as its people increasingly find themselves priced out of the food they need to survive and worried about their futures.

After last-minute diplomacy failed at the UN, the sanctions took effect Sunday at 8 p.m. ET.

The sanctions will again freeze Iranian assets abroad, halt arms deals with Tehran, and penalize any development of Iran's ballistic missile program, among other measures. It came via a mechanism known as "snapback," included in Iran's 2015 nuclear deal with world powers.

Snapback was designed to be veto-proof at the UN Security Council, meaning China and Russia could not stop it alone, as they have done with other proposed actions against Tehran in the p

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