The re-imposition of U.N. sanctions on Iran, initially lifted under a 2015 nuclear agreement, thrusts global powers back into the debate over containing Tehran's advancing nuclear ambitions. Diplomats and analysts are wrestling with the fallout, as Iran resists Western demands for compliance and transparency.

The European trio, France, Britain, and Germany, known as the E3, hoped the snapback threat would prompt Iran to allow nuclear inspections and resume talks with the U.S. Their expectations unmet, the sanctions snapped back, further straining diplomatic relations. The sanctions require Iran to halt enrichment activities, banning imports supporting nuclear weapon systems.

Iran, prepared to diplomatically counteract, may reduce cooperation with the International Atomic Energy Agency. A

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