New Delhi, May 1 -- Iran's supreme leader defiantly vowed Thursday to protect the Islamic Republic's nuclear and missile capabilities, which U.S. President Donald Trump has sought to curtail through airstrikes and as part of a wider deal to cement the war's shaky ceasefire.

In a statement read by a state television anchor, Ayatollah Mojtaba Khamenei said the only place Americans belonged in the Persian Gulf is "at the bottom of its waters" and that a "new chapter" was being written in the region's history. Khamenei has not been seen in public since taking over as supreme leader following the killing of his father in the war's opening airstrikes.

His remarks come as Iran's economy is reeling and its oil industry is being squeezed by a U....