US Secretary of State Mike Pompeo has called for a common diplomatic approach with Europe to deal with what he describes as threats posed by Iran.

Speaking to reporters at the State Department on Tuesday, the Secretary of State said he was “confident” that Washington and Europe’s shared interests would result in a common diplomatic approach to address what he called “Iran’s threats.”

Pompeo said:  "I am confident that we can collectively develop a diplomatic response that achieves the simple outcomes that we put forward.  I am confident that there is a shared set of overlapping values and interests here that will drive us to the same conclusion about the need to respond to the Islamic Republic of Iran's threats."

Pompeo also responded to critics who had denounced his 12-point list of conditions for the Islamic Republic as “unrealistic,” saying that the demands were not a “fantasy.”

A day earlier Pompeo had claimed that Washington will increase financial pressure on Iran by imposing the "strongest sanctions in history" if Tehran refuses to change the course of its foreign and domestic policies."

Pompeo’s latest remarks come after the European Union’s foreign policy chief, Federica Mogherini, warned Washington that there was “no alternative” to the Iran nuclear deal and called on the US to honor its commitments to the landmark accord.

Mogherini said:  "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."

She also noted that International Atomic Energy Agency (IAEA) has on multiple occasions confirmed that Iran has honoured "all its nuclear related commitments" under the agreement.