
The well trailed announcement came as Washington stepped up its rhetoric against Tehran, accusing it of planning "imminent" attacks and deploying an aircraft carrier strike group with several nuclear-capable B-52 bombers to the region.
Iran said it was responding to the sweeping unilateral sanctions that Washington has reimposed since it quit the agreement one year ago, which have dealt a severe blow to the Iranian economy.
It said it would stop implementing some of the restrictions it had agreed with immediate effect.
Tehran said it would abandon more if the remaining parties to the agreement -- Britain, China, France, Germany and Russia -- failed to start delivering on their commitments to sanctions relief within 60 days.
President Hassan Rouhani underlined that the ultimatum was intended to rescue the nuclear deal from his US counterpart Donald Trump who has repeatedly called for it to be scrapped since he pulled out on May 8, 2018.
"We felt the (deal) needed surgery and that the year-long sedatives have not delivered any result. This surgery is meant to save the (deal) not destroy it," Rouhani said at a cabinet meeting broadcast live on state television.
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