"This, of course, poses a serious challenge to our ability to continue working there," said the International Atomic Energy Agency's director-general.
A team of experts will visit the Chernobyl nuclear power plant to deliver equipment and assess the site that was occupied by Russian forces for five weeks.
An international nuclear energy monitor says the situation at the infamous facility remains safe, but crews face challenges in restoring power.
The International Atomic Energy Agency said Iran has increased its uranium stock by 15.5 kilograms since November.
Iran agreed to allow the IAEA to reinstall cameras at the Karaj nuclear facility after previously refusing to replace cameras damaged in a June attack.
The head of the International Atomic Energy Agency traveled to meet the Atomic Energy Organization of Iran but reported no breakthrough in negotiations.
U.N. agency inspectors have been unable to watch surveillance footage and continue to deal with other challenges in monitoring Iran's rising uranium supply.
The release could begin in Spring 2023, but the plan is facing fierce opposition from fishermen, local residents, and China and South Korea.
Iran's nuclear program has reportedly breached several facets of the 2015 nuclear deal monitored by the United Nation's International Atomic Energy Agency.
"At this stage, the agency has no indication that a radiological incident occurred," the International Atomic Energy Agency said.
The International Atomic Energy Agency's report on Iran said that the agency has "not had access to the data from its online enrichment monitors and electronic seals, or had access to the measurement recordings registered by its installed measurement devices."
"What we have is a technical understanding that provides some breathing space for the political actors to find a political solution," Laura Rockwood, who authored the Additional Protocol being abandoned by Iran, told a press call attended by Newsweek.
A concerned global citizenry must hold accountable Iran's terrorist regime.
The IAEA should make the latest information on Iran's nuclear program available for all to see.
The International Atomic Energy Agency has suggested Kim Jong Un is not moving toward denuclearization.
The IAEA stated that its observers had access "to all the sites and locations in Iran which it needed to visit" under the agreement's framework.
The International Atomic Energy Agency called the "further development" of Pyongyang's nuclear program a "cause for grave concern" in a report.
The International Atomic Energy Agency said Iran was in compliance with the 2015 nuclear deal.
The confidential report by the International Atomic Energy Agency (IAEA) did not point to any violations in Tehran's observance of the deal.
Iran must now demonstrate that it has restricted its nuclear program as promised.
Opponents of the Iran nuclear deal have pointed to the report as another reason to block the agreement.
Part of the ongoing nuclear negotiations involve lifting the sanctions currently imposed on Iran.
Iran has already destroyed its weapons-grade uranium and halted the Arak nuclear plant.
Six countries in negotiations with Iran as U.N. nuclear watchdog says Tehran must address questions over explosives testing.
Iran's foreign minister on Thursday suggested that a 10-year freeze on some aspects of the country's nuclear program might be acceptable.
The accusation intensified tensions before Israeli Prime Minister Benjamin Netanyahu's contentious March visit to Washington.