US Secretary of State Mike Pompeo's promise to slap the "strongest sanctions in history" on Tehran after Washington's withdrawal from the Iran nuclear deal has prompted an outcry from European officials.

Axar.az informs citing Sputnik.

The EU's foreign policy Chief Federica Mogherini, commenting on the possible unprecedented sanctions against Iran pledged by US Secretary of State Mike Pompeo, has warned that there is "no alternative" to the Joint Comprehensive Plan of Action, also known as the Iran nuclear deal.

"Secretary Pompeo's speech has not demonstrated how walking away from the JCPOA has made or will make the region safer from the threat of nuclear proliferation or how it puts us in a better position to influence Iran's conduct in areas outside the scope of JCPOA," Mogherini stressed.

She recalled that the Iran nuclear deal is "the result of more than a decade of complex and delicate negotiations", touting the JCPOA as "the best possible outcome, striking the right balance."

"This deal belongs to the international community, having been endorsed by the United Nations Security Council. The international community expects all sides to keep the commitments they made more than two years ago," Mogherini pointed out.