The United Nations reimposed nuclear sanctions on Iran today, putting new pressure on Tehran's ailing economy as tensions remain high in the wider Mideast over the Israel-Hamas war in the Gaza Strip.

Iranian President Masoud Pezeshkian and Foreign Minister Abbas Araghchi offered a last-ditch effort to try to halt the sanctions at the UN General Assembly met this week in New York.

Efforts by China and Russia to stop the sanctions failed as well.

The clock started when France, Germany and the United Kingdom on August 28 declared Iran wasn’t complying with its 2015 nuclear deal with world powers.

Here's a timeline of the tensions over Iran's atomic program:

Early days

1967 — Iran takes possession of its Tehran Research Reactor under America’s “Atoms for Peace” program.

1979 — US

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