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President Donald Trump has pulled the United States out of its nuclear deal with Iran, going against advice from European allies and signalling the reinstatement of economic sanctions that were waived when the deal was signed in 2015.

After months of threatening that he would abandon what he called "the worst deal ever made", Trump confirmed the move Tuesday. A signature foreign policy achievement of Barack Obama, the Joint Comprehensive Plan of Action offered the curbing of Iran's nuclear activities in return for the lifting of sanctions that had been imposed by the United Nations, United States and European Union. 

In response, Iran said it was preparing to restart uranium enrichment, key for making both nuclear energy and weapons. Iran's President Hassan Rouhani said: "The US has announced that it doesn't respect its commitments... I have ordered the Atomic Energy Organisation of Iran to be ready for action if needed, so that if necessary we can resume our enrichment on an industrial level without any limitations."