World leaders react to historic Iran nuclear deal

Iran and global powers sealed a deal on Thursday on plans to curb Tehran's chances for getting a nuclear bomb, laying the ground for a new relationship between the Islamic republic and the West. Though the agreement was hailed as a major breakthrough in a 12-year standoff between Iran, Europe and the United States, world leaders couched their reactions, underlining a lack of trust in Tehran and scepticism in some quarters that the hard-fought deal could stay standing. Here are quotes from US President Barack Obama, Iranian Foreign Minister Mohammad Javad Zarif and US secretary of state John Kerry.