TEHRAN: Iran struck a maximalist tone Tuesday after just one day of restarted talks in Vienna over its tattered nuclear deal, suggesting everything discussed in previous rounds of diplomacy could be renegotiated as Tehran demands all American sanctions be lifted.

Iranian state media reported the comments by Ali Bagheri, Iran鈥檚 top nuclear negotiator, and Mohammed Eslami, the country鈥檚 civilian nuclear chief.

It remained unclear, however, whether this represented an opening gambit by Iran鈥檚 new hard-line president or signaled serious trouble for those hoping to restore the 2015 deal that saw Tehran strictly limit its enrichment of uranium in exchange for the lifting of economic sanctions.

The United States left the deal under then-President Donald Trump鈥檚 鈥渕aximum pressure鈥� campaign against Tehran in 2018. Since the deal鈥檚 collapse, Iran now enriches small amounts of uranium up to 60 percent purity 鈥� a short step from weapons-grade levels of 90 percent. Iran also spins advanced centrifuges barred by the accord, and its uranium stockpile now far exceeds the accord鈥檚 limits.

Speaking to Iranian state television, Bagheri referred to the previous rounds of talks only as a 鈥渄raft.鈥�

鈥淒rafts are subject to negotiation. Therefore nothing is agreed on unless everything has been agreed on,鈥� he said. 鈥淥n that basis, all discussions that took place in the six rounds are summarized and are subject to negotiations. This was admitted by all parties in today鈥檚 meeting as well.鈥�

Another state TV segment saw Bagheri in Vienna also saying Iran demanded a 鈥済uarantee by American not to impose new sanctions鈥� or not re-impose previously lifted sanctions.

Eslami, speaking to Iran鈥檚 state-run IRNA news agency, reiterated that demand.

鈥淭he talks (in Vienna) are about return of the US to the deal and they have to lift all sanctions and this should be in practice and verifiable,鈥� he said.

Talks in Vienna resumed Monday after an over five-month hiatus as hard-line President Ebrahim Raisi took power. Raisi, a prot茅g茅 of Supreme Leader Ayatollah Ali Khamenei, campaigned on getting sanctions lifted. However, fellow hard-liners within Iran鈥檚 theocracy long have criticized the nuclear deal as giving too much away to the West.

Iran鈥檚 comments Tuesday stood in stark contrast to the optimistic tone offered by the European Union diplomat leading the talks.

鈥淚 feel positive that we can be doing important things for the next weeks,鈥� Enrique Mora told reporters on Monday.

Israel, Iran鈥檚 regional, nuclear-armed rival, kept up its own pressure amid the negotiations. Israeli Prime Minister Naftali Bennett, in a video address delivered to nations negotiating in Vienna, warned that he saw Iran trying to 鈥渆nd sanctions in exchange for almost nothing.鈥�

鈥淚ran deserves no rewards, no bargain deals and no sanctions relief in return for their brutality,鈥� Bennett said in the video that he later posted to Twitter. 鈥淚 call upon our allies around the world: Do not give in to Iran鈥檚 nuclear blackmail.鈥�

Iran maintains its atomic program is peaceful. However, US intelligence agencies and international inspectors say Iran had an organized nuclear weapons program up until 2003. Nonproliferation experts fear the brinkmanship could push Tehran toward even more extreme measures to try to force the West to lift sanctions.

Making matters more difficult, United Nations nuclear inspectors remain unable to fully monitor Iran鈥檚 program after Tehran limited their access. A trip to Iran last week by the head of the International Atomic Energy Agency, Rafael Grossi, failed to make any progress on that issue.