Tehran demands all sanctions since 2017 under Trump administration be lifted; Washington says it offered 'very serious' ideas but questions Iran's intentions.

Amid Vienna talks and new IAEA report indicating nuke violations, Rouhani inaugurates new centrifuges at Natanz uranium enrichment plant

Washington says it offered 'very serious' ideas to Tehran on rescuing deal, and is waiting for its efforts to be 'reciprocated'

Tehran again breaches accord's limits on its uranium enrichment, Reuters reports, as its representatives negotiate return to deal with world powers in Vienna

Delegates in Vienna pledge to continue negotiations, as Tehran reiterates demand that US drop all sanctions before returning to compliance with nuclear deal

Senior official says Iran's refusal to join EU-brokered talks was expected and part of posturing by the Islamic Republic; US to consult other parties on way forward

Western diplomats tell Wall Street Journal Tehran's rejection of EU proposal doesn't kill chances for negotiations in near future, may be aimed at getting leverage

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Several conservative candidates are vying for presidency, including former defense minister and head of judiciary; run by moderate FM Zarif also said to be a possibility

United States still awaiting Iran's response to the European invitation for a meeting; Tehran is insisting US first lift sanctions