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The United States on Thursday called Iran's missile program a "serious threat" after the clerical state unveiled a new model with its longest range to date.

"Iran's development, and proliferation of, ballistic missiles poses a serious threat to regional and international security and remains a significant non-proliferation challenge," State Department spokesman Matthew Miller told reporters.

The Kheibar missile will have a range of 2,000 kilometers (1,242 miles) and be able to carry warheads weighing over one tonne, Iran's defense ministry said.

unveiled a new ballistic named Kheibar with a range of 2,000 km and a warhead weight of 1,500 kg.

— Abas Aslani (@AbasAslani)

The unveiling comes after talks hit a stalemate on restoring a nuclear deal in which Iran promised to scale back its activities in return for sanctions relief.

The 2015 agreement, trashed by former US president Donald Trump and criticised by Israel, did not directly account for Iran's missile program.

President Joe Biden's administration has largely given up on thoughts of sanctions relief under a deal especially after Iran was swept by major protests against the religious leadership.

"An Iran with a nuclear weapon would likely act even more provocatively, and that's why we are so committed to preventing Iran from acquiring nuclear weapons," Miller said.