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warned on Monday that any roadmap to restore Tehran's tattered with world powers must see international inspectors end their probe on man-made uranium particles found at undeclared sites in the country.

In a rare news conference marking his first year in office, President also issued threats against Israel and tried to sound upbeat as Iran's economy and rial currency has cratered under the weight of international sanctions.

Despite the international attention on the deal as talks in Vienna hang in the balance, it took Raisi well over an hour before fully acknowledging the ongoing negotiations. Tehran and Washington have traded written responses in recent weeks on the finer points of the roadmap, which would see against Iran in exchange for it restricting its rapidly advancing nuclear program.

The International Atomic Energy Agency for years has sought for Iran to answer questions about particles found at undeclared sites. USÌýintelligence agencies, Western nations and the have said Iran ran an organised nuclear weapons program until 2003. Iran long has denied ever seeking nuclear weapons.

As a member of the Nuclear Nonproliferation Treaty, Iran is obligated to explain the radioactive traces and to provide assurances that they are not being used as part of a nuclear weapons program. Iran found itself criticised by the IAEA's Board of Governors in June over its failure to answer questions about the sites to the inspectors' satisfaction.

Raisi mentioned the traces -Ìýreferring to its as a "safeguards"Ìýissue using the IAEA's language.

"Without settlement of safeguard issues, speaking about an agreement has no meaning,"ÌýRaisi said.

Under the 2015 nuclear deal, Tehran could enrich uranium to 3.67 percent, while maintaining a stockpile of uranium of 300 kilograms (660 pounds) under constant scrutiny of IAEA surveillance cameras and inspectors. Then-President Donald Trump unilaterally in 2018, setting the stage for years of rising tensions.

As of the last public IAEA count, Iran has a stockpile of some 3,800 kilograms (8,370 pounds) of enriched uranium. More worrying for nonprofileration experts, Iran now enriches uranium up to 60 percentÌýpurity -Ìýa level it never reached before that is a short, technical step away from 90 percent. Those experts warn Iran has enough 60 percent-enriched uranium to reprocess into fuel for at least one nuclear bomb.

Amid the tensions, Israel is suspected in carrying out a series of attacks targeting Iranian nuclear sites, as well as a prominent scientist. On Monday, directly threatened Israel.

Raisi said if Israel decides to carry out its threats to destroy Iran's nuclear program, "they will see if anything from the Zionist regime will remain or not".