The talks are aimed at determining which sanctions the United States should lift and the measures Iran has to take in order to rein in Tehran's nuclear programme.
President Hassan Rouhani says Tehran will continue to reduce its nuclear commitments until European parties to the pact save it by protecting Iran's economy from US penalties.
Abbas Araghchi, Iran's deputy foreign minister, said progress was made at talks in Vienna aimed at saving the nuclear deal but probably not enough to convince Tehran to change its decision to go over the deal's core atomic restrictions one by one.
US President Donald Trump says his country was "cocked and loaded" to hit three sites in Iran in response to downing of a US drone but he cancelled the attack after being told 150 people would die.
The vote came after the United States imposed fresh sanctions against Iran in July, targeting its missile programme. Parliament speaker Ali Larijani said "the Americans should know that this was our first action".
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