“We will remain committed to this agreement and will do everything to ensure that Iran complies with the deal,” Merkel said, adding that Berlin had made the decision jointly with Paris and London.
Expressing regret for President Donald Trump's decision to ditch the deal, Merkel acknowledged concerns over Iran's ballistic missile programme as well as its influence in Syria and Iraq.
“There are areas beyond the (nuclear) accord that we must talk about,” she said.
Nevertheless, she stressed that the European powers viewed the accord as an “important pillar that we should never call into question”.
But the foreign policy chief of Merkel's party, Norbert Roettgen, warned that it would be difficult to adhere to the accord without the United States as European companies that continue to do business in Iran could be hit with heavy US sanctions.
“Whoever invests in Iran will be hard hit by US sanctions, and that cost can't be offset,” he warned in an interview with Der Spiegel magazine.
“So the affected companies will probably very quickly roll back their investments or pull out of the country altogether,” he warned.
The quandary was laid clear earlier Wednesday as Iran's supreme leader Ayatollah Ali Khamenei said Tehran would quit the deal unless European signatories offered solid guarantees that trade relations would continue after the US withdrawal.
READ MORE: 'A slap in the face' – how Germany reacted to Trump leaving the Iran nuclear deal
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Tom Cotton and 48 Republican senators warned the entire world that the deal was made with Obama, not the U.S.