"The Leader of the Islamic Revolution reminded his audience that His Eminence did not approve of the JCPOA but allowed for the negotiations to be held: The way the JCPOA was handled, I did not really believe in it, and mentioned this to the president [Hassan Rouhani] and the foreign minister [Mohammad Javad Zarif] and had warned them several times", the official Khamenei web page said after the Iranian Supreme Leader met with a group of Iranian students."
Negotiated back in 2015, the deal envisaged the removal of western sanctions against Tehran in exchange for the Middle Eastern country maintaining the peaceful nature of its nuclear program.
Earlier in May, Washington re-introduced various sanctions targeting Iran’s finance, transport, military and other industries. Tehran responded by criticizing other signatories of the accord for their failure to settle disagreements over the JCPOA.
Tehran has decided to partially discontinue its commitments under the deal and has given Europe 60 days to ensure its interests would be protected.
Apart from Iran and the United States, the deal was signed by China, France, Germany, the European Union, Russia and the United Kingdom.