The U.S. announced that it was "permitting the temporary continuation of certain ongoing non-proliferation projects that constrain Iran's nuclear activities" with 90-day waivers, while ending exemptions relating to heavy water and the transfer of enriched uranium. In a 4 May statement, the E3 and EU "note[d] with concern the decision by the U.S. not to fully renew waivers for nuclear non-proliferation projects in the framework of the JCPOA", while also expressing "regret and concern" with respect to the earlier U.S. decision to end sanctions waivers on Iranian oil sales. Also on 4 May, Iran's nuclear chief, Ali Akbar Salehi, maintained that U.S. "measures will not bear fruit and all will end in favour of Iran".