Brian Hook calls for international naval force to protect ships in Persian Gulf, as tensions soar and Tehran readies to breach key provision of nuclear deal

Foreign minister rejects US president's notion of a short war as 'illusion,' says Washington 'not in a position to obliterate Iran,' as war of words escalates

Meeting with world leaders will give Trump chance to articulate strategy for containing Iran to skeptical international community

Parliament speaker says Tehran downing US surveillance drone over the Gulf will deter Washington from additional acts of 'aggression'

Experts say the reported American hack after downing of drone and Iran's denial highlight difficulty of verifying cyber operations

US president says he doesn't hope for military conflict with Islamic Republic, 'but we're in a very strong position if something should happen'; will discuss Iran with Putin at G20

As war of words escalates and after White House targets top officials, supreme leader blasts 'sinister' American government

As efforts to salvage 2015 pact flounder, Tehran gears up to enrich uranium closer to weapons-grade levels, inching closer to an atomic bomb

President tells French counterpart Macron that Tehran 'has no interest' in ratcheting up spat with Washington, but will give a 'decisive response' if airspace violated again

US president berates Rouhani's 'very ignorant and insulting' response to fresh US sanctions