LONDON — Iran, Russia and European leaders roundly condemned President Trump’s decision on Friday to disavow the Iran nuclear deal, saying that it reflected the growing isolation of the United States, threatened to destabilize the Middle East and could make it harder to resolve the growing tensions on the Korean penninsula.
The reaction was far from panicked, as Mr. Trump’s decision punts to Congress the critical decision of whether the United States will reimpose sanctions on Iran — a step that would effectively sink the deal.