US Secretary of State John Kerry has sought to reassure sceptics in the US Congress who worry that Iran might not follow through on its obligations.
Iranian-Americans reacted with some skepticism to a breakthrough agreement by Iran and six world powers to curb Tehran's nuclear program.
The Iranian leader has promised hardliners that the West will not dictate the terms of nuclear engagement.
The US Secretary of State urged senators to "calm down" over new sanctions, warning they could scupper talks aimed at slowing Iran's nuclear drive.
France's President François Hollande and US President Barack Obama are both seeking guarantees that Iran will not develop nuclear weapons.
Iran and six world powers have failed to reach a deal on Tehran's nuclear programme, but are scheduled to meet again on November 20.
High-stakes talks between Iran and global powers on reining in its nuclear programme will stretch into a third day in Geneva.
Brazil, which hotly denounced US surveillance of its leaders, itself spied on US officials as well as on Russia, Iran and Iraq a decade ago.
With its glittering mosques and spectacular landscapes, Iran's new leaders are overhauling visa requirements to boost its tourism industry.
Iran has rejected the West's demand to send nuclear material out of the country but signalled flexibility on other aspects of its atomic activities.
As Iran's new president reaches out to the West with a message of moderation, Israel's hawkish approach looks likely to come under pressure.
Iraqi officials deny allegations that they killed the Iranian exiles in an offensive on Sunday.
Zimbabwean police are looking for two journalists who wrote the story about a secret uranium export deal between Zimbabwe and Iran.
Israel is not convinced that the aims of new Iranian President Hassan Rowhani, who was sworn in this weekend, will change
Hassan Rouhani has a lead in Iran's presidential election, garnering nearly 51% of the vote at 76% of polling stations, says the interior ministry.
Iran's reformists have backed Hassan Rouhani, a moderate cleric who has emerged as the dark horse candidate in the upcoming presidential election.
Iran's presidential candidates may differ, but they are united in pursuing what they see as its peaceful atomic ambitions.
Pakistani troops have scrambled to aid the remote victims of an earthquake centred in nearby Iran, as a strong aftershock has jolted the region.