Fresh sanctions levied by the United States drew an intense reaction from Iran on Tuesday, with a senior official saying they spell the “permanent closure” of diplomacy between the two countries.

Iran said it would take new steps to reduce its commitments under its nuclear deal with world powers on July 7, according to Fars, Iran’s semiofficial news agency.

Ali Shamkhani, the head of Iran’s national security council, said European signatories to the nuclear deal had not done enough to save it, during an interview with Fars. The landmark 2015 deal requires Iran to curb its nuclear program in exchange for the lifting of sanctions.