Iranian deputy foreign minister says will report back to Tehran for decision, but country will continue to reduce commitments to uranium caps unless 'expectations are met'

Regular quarterly meeting in Vienna comes with Tehran poised to exceed uranium enrichment caps in wake of US pullout and skyrocketing tensions

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

Tehran's UN envoy says even if Islamic Republic violates key provision of 2015 pact, it could reverse move quickly; up to Europe to show 'tangible results'

US economic clout is just too strong and European backers have no leverage to convince the Trump administration to change its policies, experts say

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

Anonymous diplomats say Tehran will not cross threshold on Thursday as Islamic Republic claimed, but with production rate of roughly a kilo a day, will get there in coming days

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

'If I have an opportunity to leverage a better deal, then I’m going to do it,' says New Jersey senator, who voted in favor of the pact in 2015