As President-elect Joe Biden readies to take office next month, European powers are hopeful the US will return to the pact but Iran has already abandoned limits placed on its nuclear activity laid down in the initial deal.
The new law gives 2015 pact’s European signatories two months to reduce sanctions on Iran’s oil and finance sectors, in the absence of which the government will halt UN inspections of its nuclear sites and step up uranium enrichment.
United Nations atomic watchdog says Tehran feeds advanced underground centrifuges with uranium gas, breaching 2015 nuclear deal.
The President-elect is expected to refocus US policy in the region on multilateralism and normative values, but it could increasingly become tied to domestic concerns.
After the fallout of nearly every major nuclear agreement, New START is the last accord keeping the world from slipping back into a Cold War.
The embargo on the sale of arms to Iran was due to start expiring progressively from Sunday, under the terms of the UN resolution that blessed the 2015 nuclear deal between the Islamic republic and world powers.
Iran's President Hassan Rouhani says Washington's "maximum pressure" campaign against Tehran has thrown the US into "maximum isolation".
The UN envoys for Britain, France and Germany said that they remain committed to retain the nuclear agreement with Iran.
Washington will do everything it can to enforce UN sanctions on Iran if they are violated, says Secretary of State Mike Pompeo, following the US move to restore all UN sanctions on Iran.
The embargo on conventional arms is due to expire in mid-October, as agreed under the 2015 nuclear deal among Iran, Russia, China, Germany, Britain, France and the United States.
Iran's supreme leader has responded by ruling out negotiations with the US over Tehran's ballistic missile and nuclear programmes and urging Iranians to resist pressure.
With the main centres of power in Iran now firmly in the hands of the Revolutionary Guard, reconciliation with the US is near impossible.
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