Israel praised President Donald Trump's decision to pull the United States out of the Iran nuclear deal, while Washington's allies in Europe expressed regret over the decision and said they would to try keep the pact alive.
"The European Union is determined to preserve it," EU foreign policy chief Federica Mogherini said of the world powers' 2015 agreement with Tehran. "Together with the rest of the international community, we will preserve this nuclear deal."
"I am particularly worried by the announcement tonight of new sanctions."
Former president Barack Obama, under whose administration the Iran nuclear agreement was reached, said the decision was "misguided."
"I believe that the decision to put the JCPOA at risk without any Iranian violation of the deal is a serious mistake," Obama said in a statement.
French President Emmanuel Macron said he regretted the decision and would work on a broader agreement covering Iran's nuclear activity, ballistics programme and regional activities.
However, Trump's announcement was hailed by Washington's principle allies in the Middle East: Israel and Saudi Arabia.
The deal was "a recipe for disaster, a disaster for our region, a disaster for the peace of the world," Israeli Prime Minister Benajmin Netanyahu, who has long opposed the deal vocally, said in praising Trump's decision to quit.
Saudi Arabia, a Sunni Muslim power that considers Shi'ite Iran to be its main regional foe, also hailed Trump's decision.
"Iran used economic gains from the lifting of sanctions to continue its activities to destabilise the region, particularly by developing ballistic missiles and supporting terrorist groups in the region," said a statement carried on Saudi-owned Al Arabiya television.
Belgian Prime Minister Charles Michel said scrapping the Iran deal meant more instability in the Middle East and said he "deeply regrets" the announcement by Trump.
EU and its international partners must remain committed and Iran must continue to fulfil its obligations," he said.
The chairman of EU leaders' talks, Donald Tusk, said Trump's stance on Iran and international trade "will meet a united European approach" and that all 28 EU leaders will discuss the matter when they meet in the Bulgarian capital next Wednesday.
A prominent European Parliament member, Manfred Weber, deputy leader of German Chancellor Angela Merkel's sister party in Bavaria, called Trump's move a "strategic mistake".
