Zarif tweets graphic which he says shows flight path of drone into Iranian airspace earlier in May; Rouhani says US fueling tensions

At House hearing, Democrats grill Brian Hook over US president's policy toward Tehran, warn it could lead to a war rather than negotiations

Against backdrop of Gulf tensions, Iranian president warns Tehran will 'inevitably have to take more measures' if it doesn't see 'proper response' from accord's other signatories

Shinzo Abe urges Tehran to play constructive role in Mideast, warns of 'accidental conflict,' hours after Houthi attack on Saudis

In British television interview, US president says Tehran 'was extremely hostile when I first came into office,' and 'probably maybe' remains a 'terrorist nation' now

Hassan Rouhani says 'the enemy' must recognize that leaving nuclear deal was a mistake before Islamic Republic will return to negotiation table

Rouhani says any future negotiations with Washington must be conditioned on 'total respect' and 'framework of international law'

Iranian president says the 'road is not closed' and urges Washington to return to negotiation table over nuclear deal

Amid war of words and escalating tensions between Tehran and Washington, vote could provide political cover for uranium enrichment

As Pentagon mulls deploying more troops in Middle East, Iranian president says situation is 'more complicated' than the Iran-Iraq war of the 1980s